there is a lot more to it than just the projectile size and weight. either one can hurt more.
paintball has universally endorsed velocity limits set at 300fps which makes it safer (i will get to why in a bit)
airsoft has no velocity limits and some of the snipers can shoot upwards of 7-800 fps, there has been a few cases of people getting shot in the neck at close range from a sniper and bleeding out in the woods before help can arrive, typically snipers are supposed to not shoot anyone within 100ft but without any kind of universal rule on the fps there is no way to guarantee safety like you can for paintball
also while the airsoft projectile is smaller it also does not squish like a paintball will so it leaves a much smaller and deeper impact rather than a paintball which kind of deforms and spreads out its energy as it breaks (this is also why a paintball that bounces off of you hurts slightly more than a paintball that breaks, no break = contained energy that is transferred to your skin rather than going out with the exploding paint)
i will say for the MaJoRiTy of airsoft guns out there that shoot right around 300fps or under the paintball will typically hurt more but the range and speed really are the determining factors in this question not just if it is an airsoft bb or a paintball that comes out of the barrel
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Much less. If you find the ratio of mass to speed, paintballs have a greater ratio, more power, and more pain.
Yes, even though an airsoft bb is faster, a paintball is much larger and weighs more (their weight difference is greater then the speed difference..
Paintballs will always hurt more than airsoft. Even though they may travel 1/2 as fast as the fastest air soft pellets, they weigh nearly 15 times as much.