Hi Ebiker01! Thanks for the question. First, let me say that most of that question I left to others and their experience. One person well known on these channels who sells both bikes was pretty adamant confidentially that R&M are less problematic. In fact, he (and others) said the belt drive system is extremely stable. When I first rode a Stromer I was blown away -- I loved it. But the dealers convinced me to go with R&M.
Also, I first got to know R&M on a trip to Mainz, Germany last year. Friends of my wife's parents each had one and completely loved them. I could tell instantly that they were premium.
Lastly, in riding them, my analogy is that Stromer feels like BMW; R&M like Mercedez. Stromer feels a little more sporty; R&M more plush -- the suspension helps, but I also think it's a more thought out bike. Feels more complete in some way.
That said, I wouldn't judge anyone. As I said, today was my first commute. I received two comments. The first was on the way to work from a cyclist who screamed "Nice bicycle!" The second was on the way home. A guy in a truck pulled up next to me at a stoplight, rolled down his window, and said, "That is an amazing looking bike."
Thanks, I said. Then beat him across the intersection.