First of all, the .357 is a .38 cal cartridge. All .38s shoot a .357 bullet.
As for the .45LC or 45-70, I'd go with the 45-70. Versatility is the name of the game, and gun weights would not be differant between a .45LC or a 45-70. A 45-70 can be down loaded for a very mild shooter, with a slow shove for recoil, that kids can handle well. Or it can be loaded to the Lever gun loads that can be a real stomper. These heavy loads are capable of taking anything in North America. You can load pistol bullets in the 45-70, but you can not load the heavy rifle bullets in the .45LC.
I have a couple of friends that retired and moved to Louisiana, They both got H&R 45-70s for the primitive hunts. Both claim at 100 yards they are getting one big hole when shooting five rounds at a paper target. Since ranges are close, around 40 yards on the average, both are loading on the mild side. Starting loads for the Trapdoor tables. Both guys are claiming complete bullet pass throughs, with no destroyed meat due to hemorrhage. Deer go down on the spot, and don't get up.