The question is.... Do you hand load? I got and prefer the 38-55 for exactly the reasons you mention, and enjoy it emmensly. Problem is that factory ammo is hard to come by, only Winchester of the big boys is offering it, and the stuff is enemic, but true to the original ballistics, a 255 grain bullet at 1300 fps.
If you handload the 38-55 is an absolute joy, but it will be at it's best with cast bullets, and there are only a few jacketed bullets available, again pricey.
If you don't handload the 45-70 is the only real choice, lots of loads are available, mild to wild, and lots of bullets and molds if you handload/cast/buy cast.
My hottest 38-55 load so far is pushing a 264 grain cast bullet at 1800-1900 fps. Perfect for deer in the woods. My play load is a 250 grainer at a sedate 950. The plinker can be shot all day, the juicy load lets you know but it don't beat up up.Not so with the 45-70.
Don't know if that will help, hope it does.