The only advantage I see with paintball is when you're tagged, its often more obvious other than the rare cases of the paintball bouncing. Because it leaves a colored mark. So you can weed out cheats.
This leads to the downside to airsoft, which is BBs can ricochet off walls and other surfaces, which hits you. So sometimes you are unaware if you are legit hit or from a ricochet. So you might opt to surrender yourself if you are honest, even though the guy on the other side probably technically didnt tag you from direct hit.