Any chance you can ride all three to compare?
The R3 is a big 'un but Wendy is only a snitch over 5'0" and she can reach the controls of my R3 better than my America.
All lubed up (

), a new R3 is 57kg heavier than the Super Glide and 47kg heavier than the Fat Bob with a 40mm higher seat than the Super Glide and 60mm higher than the Fat Bob.
I'm biased but the R3 doesn't feel like a big bike when you're on it (mine is a standard R3, not a touring).
Shaft drive is great too

You pays your money, you takes your choice.
Enjoy whichever you get.