Depends...
IF what you want is a CCW gun that can also hunt, the GP100 is of interest because it can handle the hottest .357s, which in turn are the lowest-powered effective deer loads
The Redhawk in .45LC is a better deer gun. It's also damned effective for self defense - see, the standard-pressure .45LCs are in the same power range as .44Special or a bit hotter; the Winchester 225grain Silvertip JHP pulling about 900fps is a splendid personal defense load. The Redhawk can also handle the monster .45LC+P loads which are the equal of the .44Mag if not hotter.
The GP100 will be cheaper to feed practice ammo. If you reload, that won't be as big an issue either way.
One point: if I were buying a Redhawk and I was *not* a reloader, I think I'd pick a .44Mag Redhawk over a .45LC, although the difference isn't all that extreme. With a .44Mag gun, I can get "light-loaded" .44Mags in the same power range as .45ACP/44Spl/.45LC for self defense, and for hunting there's those monster Garret .44Mag+P that are labelled "Ruger Redhawk/SuperRed ONLY"
. 330grains pulling a healthy 1400fps is up into the lower end of "handcannon" territory if I needed it.
But there's some very good .45LC+Ps available too. I'd like to see Garret load for that caliber.
The only downside to the Redhawk option in either caliber is carry weight; either caliber would make a fine car gun, plinker or hunter. The Redhawk in .357 was dropped because the GP100 is as strong a .357 as you could possibly need, but lighter.