Brakes
Are you a stickler for genuine Mercedes parts? If so, even an independent shop can get genuine parts. If you are OK with aftermarket parts, maybe ask the independent shop which brake part brands they use. Some aftermarket parts are better than others.
I remember several years ago with my 2017 ML350, the Mercedes dealership told me that if they did not install the brakes, the brakes would be noisy and various sensors would be installed wrong









