After having fun with a RMU playtest - I have been thinking about getting back into RM. Should I wait for RMU or go with RMC?
I'm firmly rooted in RM2
But I have been trying to wrap my brain around RMU with the Playtesting and new rules. I'm not yet comfortable enough to run a session with my players yet as there are still some PC generation questions I can't iron out. Reading through the errata posts is time consuming, but I'm mucking through it.
I have only worked with RMC on a couple of occasions and it is close to RM2, but not quite the same. I know I am biased when I say stick with RMC only because it is so close to RM2, but I didn't really like RMSS at all. I tried. I really tried.
It seems you may have inadvertently answered your own question: "After having fun with a RMU playtest..."
If you had fun with it and really liked it, run with it. That's the whole point of FRP... have fun.
The only other question I would ask: Do you have a lot of money already invested in RMC? For me, I have so much money invested into RM2, with RMC being so close to RM2, there's no point in me investing in a "similar" system. I would have invested in RMSS, but I didn't like it. RMFRP was similar to RMSS, so again, no go. I am reading through RMU now and really trying to keep an open mind. I just need more time to digest it.