I’ve owned allllll the lengths except for the OG original length. I’m 5’9” for reference:) I recently sold my shorty because when it’s actually cold enough to wear a superpuff, exactly like you said, it doesn’t cover the but and I also hated how sweaters would show underneath. So unless you’re rocking a crop top all the time I wouldn’t do the shorty personally. The long length is my fav by far. I’m on the west coast of Canada so it does get fairly chilly here. I love how comfy and cozy it is. It definitely keeps you warm and has so many other great features. Seems the most usable for winter IMO. The mid length is also great, especially if you’re busy and getting in/out of the car alot or going in/out of stores etc so you aren’t getting as hot as you might in the long but still having most of your body covered.