It all depends on the people you play with, to be honest. I've done my fair share of paintballing, but I never got into it because the paintball crowds around where I live aren't fun to play with at all. They're elitist, dishonourable, and above all else, rude. It's just not fun. When I play with friends, and only friends, it is a complete blast. Going paintballing with my friends from high school and university is some of the most fun I've ever had, but it takes a long time to plan.
In the end though, I personally prefer airsoft. The "unrealistic" nature of paintball doesn't bother me that much, but it is certainly fun to have guns that look like, well... guns. The big factor in my situation though is the group I play with. They're some of the nicest, most relaxed, all-around great guys I've played with. There's hardly ever any disputes, and when there is they're taken care of in a very professional manner. The entire atmosphere is great so if we have eight or so guys show up one evening and we've never met each other before, we'll still have fun.