Brake upgrades

I seen a lot of people go with Powerstop, but is that actually an upgrade? Or is it more of a boujee Oem grade part? Also, I know some people do gt500 brake conversions which would be cool, so what would i need for that? I dont mind spending a little bit of money if i get better braking power. And before any of you ask, yes i have good tires, and upgraded suspension