Scale is longer than the genius, being cramped on an old Genius is a common complaint. I’m 6’2 and on an XL Scale RC with a 110mm stem. you should be fine on a large.
The scale frame has been pretty much unchanged for a good while and there are loads out there, the 20 is a great model to go for as it has a lot of nice parts without the price tag of the HMX frame of the RC, which itself is a nice bike if a bit on the expensive side.
There’s no difference framewise other than colours on 2011 bikes unless you go for the 899 frameset (unlikely I think if you’re looking at the 20 model)