Wow so many answers but anyways I will post my usual long answers for your questions but I think I will expand it considerably.
Owen Hart - Owen Hart was one of the best wrestlers in that era of WWE wrestling and he showed the best of his abilities against his relative, Bret Hart. I think he is one of the more underrated wrestlers and he is well known enough to be listed in the top 30 most popular legends. Outside of WWE, he was well liked for his good and overally friendly character and he made a high amount of friends. He was also a good family man and I don't think he received any backstage heat and many can interpret his attempts at doing the piledriver and injuring Steve Austin as a mistake that shouldn't be take into significant heights. He would have done more and gained more popularity had he not fell from a considerable height.
With Pillman, I can only remember him for his association with Steve Austin where he later turned against him to align himself with Stone Cold's biggest detractors at the time. He was a good superstar since a lot of erudite fans give a positive opinion of him. Nonetheless, I still choose Owen based on the fact that I have more knowledge of him than I do of Pillman.
Brock Lesnar - Brock Lesnar always performs fantastically well when he steps into the ring and I always enjoy his work. He has a decent moveset that is enjoyable with those painful-looking german suplexes and the crushingly powerful F-5. He is an elite level talent and he would have been even more better had he not have that one terrible flaw of frequent absence.
Vader was a good superstar with a massive bulk and his match with Shawn Michaels at Summerslam is perhaps his best match with HBK carrying the man well through the match but I haven't seen more of his matches and I know his involvement with NJPW and his hardcore matches but the thing is I actually haven't seen any of those matches but I know for a fact that Vader was a good match since that match with Shawn received positive reviews from critics.
I've known Lesnar more so I guess I lean towards him here.
Neither - Although I have no interest in NJPW, I have read the reviews made by Dave Meltzer where Shinsuke Nakamura had arguably his best match(according to Meltzer) against Kota Ibushi but I don't care about any of them in general.
Rey Mysterio - Even now, he is still one of the best high flyers of the world and perhaps the greatest cruiserweight superstar in wrestling history. At his prime, he was legendary and performed elite level high flying which triggered high astonishment from the audience. He is mainly referred to as the Ultimate Underdog which is an excellent nickname for him because he is not strong nor is he big and when he is put against a bigger and more powerful foe, the odds are always stacked up against him but the one thing that Mysterio has is his heart and he instead resorts to his quickness and high flying to bring down bigger foes which he has done many times. He even showed an act of defiance against The Undertaker and proved to be capable opponent for the much much more powerful Undertaker.
Drago hasn't shown anything, not just high flying that is able to put him on the level of Rey Mysterio and he is simply just an high flyer. I did look up on Drago because you listed him and he works for Lucha Underground but that is all I know of him. Perhaps if he came to NXT, he would be more exposed and I would be able to look at his matches and review them.
Johnny Gargano - Don't get me wrong, I respect Ricochet as a superstar and I enjoy his work as a high level high flyer but Gargano is someone I really like and respect. He always makes the best of his big matches which are usually critically acclaimed and he is clearly a diligent worker with excellent talent. When he has a big match with Tommias Champa, you'll know that it is going to be 4+ match just like AJ Styles vs John Cena. When Gargano comes up to the main roster, I don't want WWE ruin this man and he is more suited for a main event role rather than a mid card role.
Ricochet continues to have good matches and I would like to see a match between him and Neville so that the can show their chemistry in the ring and put on the show that leaves every fan impressed and happy. He is among the top high flyers in WWE but he should get exposed when he makes it to WWE.
Neither - I looked up these two but I wasn't interested in any of them but I do know WWE consider or do consider Ospreay.
AJ Styles - I really like these two but I like Styles a little bit. He is currently the best talent that WWE has but what is even more better is that he lives up to his moniker. He always performs at a phenomenal level that places him among the best wrestlers in the world. He sells excellently with great emotion, with great passion and with great effort and not many can sell as good as him. One of the best thing about him is his interactions with his opponents in the ring, he always make his opponents look good and better yet, he brings out the best in them. Examples include:
-Jinder Mahal, a particular mediocre wrestler and nearly of his matches are below decent and even the great Shinsuke Nakamura who carried him in both of their matches couldn't do anything to make the match decent. AJ Styles challenged the bland wrestler and made their match together actually decent.
-Baron Corbin. Corbin is one of the less talented wrestlers but his match with Styles where Styles had his rematch clause was a good match with Styles carrying Corbin through the match.
-Shane McMahon. For someone who wrestles rarely, Styles gave Shane his best match that exceeded the one with The Undertaker. It's safe to give the match ***1/2 because it was awesome.
-Brock Lesnar. Styles is responsible for giving Lesnar his best match since 2013 against CM Punk. The match was absolutely awesome with Styles proving to be a powerful challenger to Lesnar after Styles was dominated early on until making a major comeback and the match would have been considered a ***** if Styles managed to kick out of the F-5 before being beaten by another ob=ne or perhaps beating Lesnar.
Oh my I wrote so much stuff that I didn't say anything about Michaels. Shawn Michaels is the best hall of famer and he certainly had better matches than Styles without a doubt but I just like Styles more because he is a very nice guy backstage.
Braun Strowman - He is a big man with a likeable character and he is said to be the best monster heel ever, a claim I absolutely agree with. He has a good theme and an intimidating look with a fitting hairstyle and attire. I won't undermine Sheamus and I will say he is a good wrestler, not average but really good wrestler that has had great matches with his partner, Cesaro but he has a boring character that hurts him.
Chris Jericho - He is a legend and purely exceptional in mic work and wrestling work and he is the king of WWE catchphrases and if you want to know all his catchphrase, you can ask Chris The Jericho Fan who is the biggest Jericho fan here. Steamboat is a popular legend but thing is that when Steamboat is mentioned, he doesn't receive a powerful reaction like Steve Austin and Shawn Michaels usually receive.
The Miz - Because he is.....AWESOME!! but actually because of his mic skills and promos. He has improved over the years and he is pretty good in the ring, in fact he is one of the better wrestlers in WWE. His mic skills and promos are what really stands out for him and he knows how to play his heel character very well. Kevin Owens should improve if he wants to exceed Miz in mic skills.
Seth Rollins - Rollins is one of the best and most diligent workers in WWE and he is performing absolutely.....Glorious!! and he keeps on improving. Soon, he will replace CM Punk and become better than Punk ever was. Who knows? maybe he has. I like Nakamura and his heel gimmick is interesting but if he can win at Extreme Rules and enhance his character and stop being kind of lazy then I might lean towards him.
Jushin Liger - He invented some moves. None of the Tiger Mask incarnations are as great as Jushin is.
Neither - DUD! but honestly I just don't like these two at all. Kane is just extremely creepy and Abyss of Impact is just grotesque.