The old friends are definitely the friendships that last longer.
I moved half way across the world 4 years ago.. horrible for me.. barely made any friends it was hella hard and no matter what, we always keep in touch. I still miss them like crazy and when I see them again it's like.. I feel like my old self again, like I don't need to prove anything to them. The new friends are more up to date with me, I think I love my new friends as well.. they know the new me or who I am today.. but that's not a bad thing, I love them too. I have tons of fun with them and I'm always happy to see them when I go back to like... modern home. But yes, I think they are both awesome, but there's no one better than your real friends. =]