the specs on all three bikes are the same, wheelbase, weight, etc. The only difference in tires now is an 18" rear wheel on the C5, all the rest of the wheels are 19".
The G5 has the most comfortable seat, equal to the Scrambler's. The C5 seat gets the most criticism. The B5 is pretty hard and the new shape is not one I like.
Any of them have pretty much equal capabilities. The C5 probably has the most available accessories as it's pretty much the old 350 frame which is the old iron barrel and you can use a lot of the accessories off them.
Bare