I can only tell you what I'd do, and that's if you want it, get it.
If you do get one, I'd try for one with the tighter twist. That big case just begs to sling heavies, and you can still shoot 240s/265s. A .444 with a 300 grain (or heavier) hardcast is a beast.
Insofar as deer, pig, or black bear hunting, the 77/44 is enough, but I would feel better with a trip4 on the bigger animals such as elk, moose, and the big bears.
You mentioned .45-70 vs .444, and that's a debate I don't understand. Both can shoot light bullets fast or chunk out heavy ones, and there isn't anything on this continent that can stand up to either.
Match the bullet to the job and heck with the headstamp.
