Make sure you look into why the brakes ended up causing pulsation in the pedal. I can tell you that they didn't warp. Often times it could be a dirty hub, other times it could be that the lug nuts were improperly and unevenly torqued. If you have a dial indicator, you'll want to do a runout test on both the hub surface and the rotors surface.
I've always used aftermarket stuff with no issues. I'm a brake tech and I don't notice a difference in brake dust due to the pads being aftermarket. I also see the same cars come in now and again for different things.
Most of the time the aftermarket stuff is just as good as the OEM. People will run into an issue when using a aftermarket brand and blame it on the pads rotors rather than installation issues. As straight forward as a brake job seems, there are a lot of small things that can go wrong that aren't that obvious.