The reason to move away from Bafang is to have a more natural, smoother pedaling experience. My bike has the Luna-tuned Bafang Ultra motor, and even PAS 1 is too powerful sometimes. The R&M bikes I test rode had a much better torque sensor and/or program. With the Ultra, I always feel like the bike is being powered. With the Bosch (and I've heard, Specialized and Brose and Shimano), I simply felt stronger. The multiplier effect is more seamless. The Bosch display (depending on which one you get) can show range remaining and there's a version that connects to a smartphone. Read the forum here and while there's complaints about Bosch's display software, as far as I can tell it's more functional than Bafang's.
With the new 2020 Gen 4 motors, Bosch no longer penalizes you for pedaling faster than the speed cutoff. Since Watt Wagons are commute bikes, you'll want the Speed version, both for top speed (28 mph) and to have a torque curve that matches an on-road experience.
However, what will your bikes offer that Riese & Muller don't? The SuperDelight, for instance, is a full-suspension Bosch eBike, available with electronic Rohloff, Magura brakes, rear rack (on a full suspension bike!), and dual batteries for at least 1KWh. With titanium, you can make a lighter bike. Maybe you'll stick with a hard tail design to save costs, but R&M has one of those, too.
EDIT: If you could get your hands on the TQ motor in its fully blown form (see the M1 Spitzing, for instance), that would be really great.