Questions: self drilling/ tapping screws for chassis work

hex head self tapping screws with cordless drill. No need to drill pilot holes. I've installed literally hundreds in steel and aluminum and never have snapped one. I don't even bother to set the torque slip on the drill. you know exactly once it penetrates and then I back off the speed.

I prefer the hex heads rather than a torx or robertson head. lots more material in the head and a 6 point hex head driver works well.