I would buy MB Filter because it comes with the 3 o-rings you need for it. The aftermarket may not come with them and you should always change O-rings when doing new stuff. I would also get the copper washer that goes on the drain plug bolt. All this stuff is under $20. I am actually about to go get another filter. My 5K mile mark is up. Shes 100 miles shy of 80K miles. Make sure you get Mobile1 0-40 Full Synthetic for the Kompressor motor. Auto Zone they are about $7 each and I am pretty sure our motors hold 5.8qrts.
Hope that helps.
FYI - My Local MB dealership in Brentwood, TN has FREE 63-point inspection this month if anyone is close. $105 value.