but both have pluses.
with co2 you can carry multiple tanks with you to the local woods and have a whole day.
most people dont have the kind of money needed for 3 tanks of HPA.
co2 is fine for markers that are non electronic and cycle slower. like a regular semi auto.
HPA is a must for faster guns and electronic driven markers like autocockers, angels, ions, ect.
Hpa is cleaner and does not fluctuate FPS (feet per second, aka velocity) as much as co2 does. in cold weather co2 has a tendency to deliver poor performance. Co2 is initially cheaper to buy the tank, but in the long run you will spend more on co2 fills than you will if you have a HPA system and play at a field that offers free fills or an all day fill pass, plus with HPA you dont have to remove the tank to refill at the field, an added bonus.If you do choose to go with HPA spend the extra money and get a bigger tank, 4500psi will hold 1.5 times more per cubic inch than a 3000psi. there are charts on the internet that will show you how many shot average you will get per fill for both co2 and HPA, search and see what will fit you best
Figure out what type of gun you have. where you will play and how fast and much you shoot.
low bps semi auto markers
not as consistant as HPA
cheaper cost of tanks
able to last long , a 20oz can can shoot about 1000 rnds.
not affected by temperture
great for high bps markers
must have for electro markers
Expensive to buy but cheap to fill
best of luck
paintballin since 97