Matt
I would go with CO2 because i find it easyer to replenish the gas supply for the gun but other than that i dont think it matters. please anwer mine

Famine Airsoft
I don't know how much experience this other person has, but I am a professional airsoft player. In my opinion, gas is MUCH better. The professional players will hardly ever have a CO2 pistol, but most often gas. One reason for this is the fact that CO2 canisters are not very hard to puncture, which means you will lose the CO2 and have to buy more. Just because it's cheaper doesn't mean it is better to choose. My teammate had a CO2 pistol, and he went through about 7 canisters of the stuff, as they kept breaking due to heavy action. He sold the gun and doesn't regret it whatsoever. Plus, gas guns tend to be much faster and more accurate. In my professional matches (30 vs 30) there is one guy (can't think of his callsign at the moment) who just uses a gas pistol and does AMAZING against everyones AEGs. Plus, you will NEVER see a professional player with a CO2 gun because of the reasons above. Hope this helps.