Are you speaking in terms of general purpose or just for SD purposes. For SD, it it is hard to beat either one, except of the limitations of number of rounds in a revo chambered in .357. I would prefer an auto pistol for SD, so it would have to be a .45 acp for that purpose. Have 4 of the .45 auto pistols I use more than anything else in an auto. As a general purpse firearm, I would use a .357. Mostly cause of the .38 spls. which I shoot the most of for plinking and such. Hate losing brass like with the auto pistols cause I reload for both. And it is still right up there for SD in .357 if ya have nothing else. Other things to consider about .357s is muzzle flash in dark areas and recoil recovery time with hot loads.
If I had to make choice of one or the other, it would be the .45 in an auto pistol. It does everying the other round does and for serious work and ya have more capacity in most cases and faster reloads.