I think the SC has better proportions for you. In my experience, one is looking more for the natural proportions of the coat than for the overall body ratios, because the coat and its lines are so prominent. The second coat is slightly wider at the shoulders and has more natural proportions. It is also more pleasing in relation to your head. The suit emphasizes the stretched look, in particular when one looks at the breast.
I recently posted this in the German forum (as part of a larger study of shapes and styles). These three SCs are of exactly the same length and A and C are the same shoulder width and waist. I was a little bit surprised that several people found A to be the most flattering. Btw I have the opposite problem of a long torso and short legs, broad shoulders and narrow hips. The long but narrow quarters of A achieve a slimmer look than the longer lapel opening of C.
I much prefer C over A, if it were an inch or two longer and the waist slightly let out. That's a really nice cut, just a bit too short for you atm. Get an L next time and you're good.