I've ridden in uncomfortable and comfy incarnations of both. Mabe the western makes me a little more "emotionally" comfy on a greener horse or a trail ride? It's definitely all in the construction of the saddle. I've seen people ride in westerns with truly wacky stirrup and rigging configurations that force their toes down, their seats out of the "pocket", and their shoulders so far forward that they are begging to roll over the horse's shoulder. I think a basically correct position goes a long way to rider comfort, and a western saddle's extra leather gives a lot more potential interference than an English.
A stubborn horse walks behind you, an impatient one in front of you, but a noble companion walks beside you ~ Unknown