Re: 44spl/44mag vs. 45colt/454 casull?
As long as you reload, I believe I would recommend you really consider the .454 Casull in the SRH. I love mine.
After your initial brass buys, there is no reason to shoot the 45 LC unless you don't have time to reload and need some low/no recoil ammo.
Why not just a .45 LC pistol? I hunt with my SRH loaded with a 260 gr cast loaded at about 1250 fps. This is a serious load for the 30 - 50 yard white tail shot, but, the recoil is manageable and not painful.
For tent nights in black bear country, I load 5 factory XTP Casull rounds and lay the gun by my side at night. This comes from a few years back when a young blackie stuck his head into our tent and snuffed. My wife spent the rest of the night in the truck. It was funny at the time (after I changed my drawers), but, she will only tent with me now if the Casull is in the tent and loaded.
I recommend installing meprolite tritium sights on this gun for night work. Those cat's eyes are very reassuring when you see them looking back at you in the dark. The set I installed are actually better for all around shooting than the factory sights furnished. (Just my opinion).
Either one will be good. My brother has the RH (not SRH) in 44 mag and loves it.