Replace your pads with Original BMW parts. These pads from BMW will restore your braking performance and give you exactly the same braking that your vehicle came with. The easiest way to know the quality of your braking will be the same as it was before.
If it's time to replace your pads, then you should also replace your rotors to get maximum braking performance. With a new pad and rotor set on your vehicle, stopping will be completely restored. Enjoy the stopping you liked when you first obtained your vehicle.
With new pads and rotors, you need to make sure they are bedded and mated with each other.