Honestly I'd have to say it's kind of a toss up but I'd tend to go towards airsoft because it's a lot cleaner. Paintball is already pretty well established though, however I don't think you're likely to find many games like you describe without going to specific simulation type paintball games because a lot of it is either; speedball, or weekend rec games that are more pickup game styled.
In regards to airsoft it's similar with weekend pickup games, you'd probably be looking more towards daysim (day simulation, eg. 9-4PM) type games with ammo limits and the like. You don't need all the hardcore gear just basic camo and something to hold your stuff.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE