The bikes I have that are disc brake are Avid so I use Avid rotors with the 6 Allen style bolt pattern it’s different than an allen but I can’t remember what you call it, ( I have the correct tool
) Anyways so far so good the mechanical BB7 on my gravel grinder may squeak some when very dusty but that is about it. The hydraulic brakes on my MTB will face plant you i you are not careful plus you can make some serious skids with the rear brake. I’ve been advised not to use knock off cheap rotors yet it stinks to fork out 30 bucks per rotor but that is how it goes sometimes.