I've said it once before: Paintball is the special olympics of airsoft.
Humor aside. You don't have to worry about paint ruining/staining your gear. Although running around in the mud seems like a logical 'other side of the fence' argument against that, it's what our gear is made for. Get it dirty.
Our game isn't as popular as paintball so in my view, it doesn't get as much negative feedback from morons shooting moving cars or pedestrians. There have been a few occasions where this has happened with airsoft guns, but not as many as paintball. That's why I kind of like how it's harder to get AS into Canada.
It's far more realistic than paintball. Having played both games, airsoft is by far a more enjoyable game.