I am a guard at a jail. We also had to be sprayed. I can tell you size doesn't matter with OC spray. About 10 percent of the population are not affected by it at all, same as some people can eat super hot wings and some sweat in mild.

Tasers are a totally different story. If deployed correctly the prongs span your spinal cord. The volts of electricity fucks your nerves and muscles up, period. Every muscle in your body contract at once and you become one big solid uncontrollable muscle. It is not about pain compliance, though it hurts like hell. I have seen it used on an ex cowboys defense lineman and let me tell you he dropped like a 6'7, 450 pound bag of potatoes.