I think it is too soon to know which strategies will work. For example, we don't know how the new terms will deal with cards which participate in the same rewards program (e.g. Membership Rewards vs Skymiles vs HHonors vs Starpoints). We don't know if 90/365 day thresholds will still have any significance.
However:
2. Everyday (Free) is now a better choice than Blue
6. There is no business version of the Mercedes card.
Oops, meant to say Business Platinum. Edited.