"44mag has much more power"
There is only one company that is loading ammunition that one could describe as having "much more power" and that is the Buffalo Bore .44 Magnum +P+ Ammo - 340 gr. L.F.N. - G.C. (1,478 fps/M.E. 1,649 ft. lbs.)
That is a beast. The .45 Colt has plenty of power Buffalo Bore Heavy 45 Colt +P Ammo - 325 gr. L.B.T.-L.F.N. (1,325 fps/M.E. 1,267 ft. lbs.)
The .45 Colt in "heavy" loads will kill anything on earth. It is "enough gun." Using this same "logic" would dictate that one should never use the .44 mag as the .454 and .460 and .480 and the .475, and the .500 all have "much more power" than the .44 mag. Buffalo Bore 460 Smith & Wesson Ammo - 360 gr. L.B.T.-L.F.N. (1,900fps/M.E. 2,860 ft. lbs.) That .44 mag sure does suck.
What fool would use that when you can get a .452" diameter bullet i.e. the same lager size as the .460, as opposed to the tiny .429" .44 mag and add a half a ton of "much more power" with a larger diameter bullet over the .44 mag?
Let's keep it real. They both work real good.