As far as the brake pads you will see different views from different people in this forum. I personally have an aftermarket name brand for everyday driving, with no noticeable difference but a LOT less dust!
If you have the originals pads, you must be very close to pads replacement and, depending how you drive, rotors replacement. Remember, MB does not recommend turning rotors. Although they are relatively cheap.
You can do a search on the subject (r upper corner) but, the final choice is yours.