Well, even though I haven't played airsoft yet, the main reason I'm switching over is because of...
1: Less pain (I'm 12 years old, paintballs hurt :lol: )
2: More realistic. Running around with a brightly colored "marker" with a big hopper sticking out the top and a huge CO2 tank coming out the back is not realistic.
3: Ammo is less expensive. Even though starting out is expensive, at least the ammo doesnt cost a lot. In paintball, 2000 rounds of good paint will cost about 60 bucks. In airsoft I usually see 2000 good BB's for 10 bucks.