The only time I played paintball, it was speedball, and I didn't really didn't enjoy it a whole lot. I had fun, but it really wasn't what I expected, and quite frankly, the immaturity and idiocy of the players and the gameplay left a rather sour taste in my mouth. Couldn't say I cared much for the style of the markers either.
Fast forward about 10 years, and not it's airsoft. I love airsoft and have no complaints at all. Yeah, there's the odd asshole player here and there, but for the most part, the community is much better all around.
I'm sure paintball can be more fun than my 1 experience with it, but when I compare the 2, airsoft will always be a clear winner for me.