I love paintball, never played airsoft though.

Me and my boys used to always play Woodsball, with Gullie Suits and all, It felt like we were at war. Plus when you are trying hard to stay hidden, and get your ambush to work, you dont waste to many paintballs and gas. I remember we had an overnight game, 10v10, long long time ago, 10k balls lasted all of us all 24 hours. Keep in in mind we played multiple rounds of speedball style games, in between our CTF games.