Doesn't really rule out either, competent scramblers wouldn't rope up for the easiest route, really just depends if you went left or right on the ridge from the In Pinn.
Banachdaich is mostly a modest scramble, with a few small tops before the summit.
Mhic Choinnich is notably narrower, and a bit harder, in my memory (only descended on that side having approached via King's Chimney), but perhaps more memorable would have been the loose scramble down the slabby/scree terrain towards the bealach below An Stac, which can feel rather insecure.
I would also suggest In Pinn/Sgurr Dearg and Sgurr na Banachdaich make a more obvious round. Certainly, that's the way we did it the first time we visited.