maybe everyone should first find out why they make aftermarket timing belts in the first place?
It's not because of the power.
It's because of what CERTAIN aftermarket cams do to load the cam gears or bind the valve train (the Lost Motion Assembly or LMA on the valvetrain being overloaded) causing the teeth on the inside of the OEM belt to shred or the belt to jump and snap.
You must understand WHY...not just say OEM is your friend or you could get __________ brand. That does NOT answer his question. If you don't know, please don't bother to reply because a guess just makes it worse.