Sintered pads aren’t recommended for pushbikes as they are a bit extreme, semi-sintered work well as a compromise and I’m pleased with their performance. I don’t like organic as they wear and overheat easily.
Kevlar are gaining popularity as they are meant to have the best bits of both but generally more expensive. I’ve just fitted cheap Kevlar pads from Discobrakes so I’ll know soon if they live up to the hype.