I've decided to dip my feet into the Marriott pool for the rest of 2021. I'm skeptical that the grass is greener... but now is as good a time to try as any.
I can't envision maintaining status in two chains, but we'll see how it goes. So far I've been able to make reservations that meet or exceed my current reservations -- similar location, better rooms/amenities, and less price. If the hotels are clean and well maintained, I may make the switch permanent.
If Hilton's F&B credit remains as-is in 2022, it will make the decision easier.