Clearly? If you're in WBC, I highly recommend the 757 flight. It's a smaller cabin, much more intimate and more personal service. The seat is EXACTLY the same.

In the back, definitely go with the A330.

As for the overall DTW-AMS schedule, looks like after October it reverts back to 2x/daily NWA 333s, 1x/daily NWA 757, and 1x/daily KLM 772.

(Of course, that could all change depending on the speed and progress of the merger as well as any changes made as a result of the antitrust ruling.)