I can really relate to this thread. I've played RM since 1982, going through RM1, RM2, and then shifting to RMSS when I last ran a campaign in the late 1990s. I'm now playing in a campaign using a totally different system (can we use names here? It sounds like math binder...) and as that campaign wraps up, it looks like I'll be the next GM.
I'm really stoked about this, as I get to pull out 20 years' worth of campaign material I have boxed up. And I was really stoked to discover that ICE had reincarnated and is putting out new material.
I quickly found myself facing the question of whether to use RM2, RMSS, or try RMU. I hate to say it, but the discussions on the forums quickly took RMU off the list. I think my group would disband rather than learn the whole system, and I have too many old home-brew rules (and campaign material I want to use) that I would have to port over.
So it came down to RM2 or RMSS. I've opted for RM2, even creating a new character creation process, to get the simplest start-up for my players. I had my college-age son, who plays tons or RPGs, try rolling a character in the RM2 rules, and he immediately threw up his hands over the process. I know I'd lose at least 2 players in our group with that reaction, so RM2, it is.