This is getting rather entertaining. May just pull the age ole keep 'em both.
The way I see it, there are two camps:
Team Large: it is BULLS WOOL. Not some cash-seta-vicuna blend. This is meant for chopping trees, and a slim fit is stupid.
Team Medium: as a sweater, the medium is more flattering, blah blah.
I feel like I understand and appreciate both sides.
And the shoulders flare up a bit on the large, not the medium. I anticipate that it will become less...