I'd rather have the 4 seasons for bad weather spirited riding. Nothing against the Gatorskins, and I have no personal experience with them... I just haven't been thrilled by any 28mm slicks that I've tried; not enough traction off-pavement but not as fast as something narrower. It's one of those OK at everything but not excellent at anything types of scenarios imho. They seem like an ideal summer tire with extra puncture protection, but I definitely don't view them as all-season.
Personally, I'd go with something like the Continental Touring Plus Reflex for riding rough roads in bad conditions, I'd only pay double the price for the 4seasons if I was riding with a group and trying to maximize speed/fitness.