By all means, check em all out!
The XCT hands down will have the most storage. SG and F6B are not even close in that regard.
I had thought XCT at one time, only because the lowers, taller shield, extra wind protection, tip over protection, ect that come with a XCT vs an XC were worth it. (Cheaper than dressing an XC how I wanted it.) Didn't need the trunk, and would most likely take it off and never use it. (That kinda seemed like a waste)
I like the improvements of the 14 SG, no doubt about it, but the shaking of a non-balanced engine, and the heat generated from air cooling, to me, is a helluva turn off. (If folks cars shook that bad and were that hot to drive, they'd demand a refund!)
The smooth, seamless F6b is quite a bit different. Almost, dare I say, a bit too smooth/seamless!