Is this a pop quiz? 'Cause the first two questions are answered in the product descriptions:
A) The 'All Weather' model has stainless stell hinge pins for lockdown, while the other uses a 'no pinch hinge and integrated lock'.
B) The 'All-Weather' model has 30 oz. marine grade vinyl material (camo in Cordura fabric) while the other has 29 oz. vinyl.
C) Haven't sat in either one, but I'd bet the 'All Weather' is more durable and practical, while the other is more comfortable.
I hope to be shopping for new seats soon myself, so if you buy either one I'd appreciate a review!