Of course the size and contour of the barrel make a lot of difference. I'd take a long, well balanced rifle over a short, ill handling one. And visa-versa.
My Bess carbine is a tiny bit butt-heavy, that barrel has a very sharp taper. I think it's 31-32", would be better at 35".
My Jeager is the best handling, best balanced rifle ever, I wouldn't add or take an inch off in either direction. I think it's 31".
But other than the weight, my 1861 with 40" barrel points, swings, and handles fine, and seems to have a neutral balance. It's barrel tapers quite rapidly also.
I've never handled a ML with a barrel under 30" that I liked. (yeah, have one, but don't use it) Sure, there is the initial "wow, this is light" factor, but beyond that it's like, "wow, the front sight dances all over the place".