Arcteryx generally has an 'athletic' fit, Marmot more 'generous'

True dat. I am a bit big in the chest and shoulders for my height so I have trouble finding tops that fit comfortably without hanging past my butt like a skirt. I find Marmot works best for me. My current shells are the ROM softshell and Minimalist hard shell. I like the Minimalist because it is a Gore Tex shell only, no lining or insulation which makes it better in warmer conditions (just layer up if it is cold). Both jackets have great hoods which will fit over a helmet.