I had the RL2s at one time and I traded them back to EM for the RL1s. There is a difference in the two sizes but not a lot.
I don't use a center stand but my guess is that the RLs would make a bit more room for one. The way I see it, with a center stand, you're losing a bit of ground clearance and the RLs are giving you some.
On a separate but similar topic. I have a center stand and lift loop that I removed when I bought the 2011 that I have. If you're looking for one, IM me and let's work out a deal.