What's the point of this argument? Both sports are ALMOST EXACTLY THE SAME THING! Seriously, the only difference is the projectile. We should be talking about our experiences and having a good time instead of arguing. I've played both sports and I think both are great. I myself own a gun for and usually play airsoft because it's cheaper (which means more money for video-games, my main hobby), and it's what more of my friends do, but I've rented paintball guns for paintballing on a few occasions.
I don't see any huge advantages or disadvantages for either sport, however, I like my 130 BB ammo capacity (I have 2 magazines that hold that, which can easily be switched in less than 3 seconds), thank you very much. I don't have the problem of people not going out when hit, the group I airsoft with has honor.
Also, WTF to the guy who says airsoft hurts more, you haven't been hit by a paintball gun on bare skin at 10 feet. Not fun, the whole area that was hit was bleeding, and paint getting in the wound hurt a lot. I had a scab for a month. On the other hand, my friend has gone full auto on me at close range with his 400 fps airsoft gun, and it stopped hurting after about 5 minutes.