It sounds like the Canadian Rockies won't be a problem for a big shelter-footprint and I didn't expect it would but during my forum research I came across at least one owner commenting about tightness in some camps with the Shangri-La 3. Thanks for that link. The illustrated pitch would indeed make the SL3 more versatile.
I've also read some comments about duo mids being a bit cramped and in someone's words not suitable for 2. That makes me feel even better about the SL3 if I go that direction.

