Neither.... They are pistol cartridges... fight your way to something else, be it a bigger gun (rifle or pistol) or a faster mode of transportation....
Be that as it may, producing (or threat there-of) a hangun solves 90% of altercations... a further 2% require a so called "warning shot" and the rest are resolved with some exchange or one-sided offering of fire. Since he who shoots first, fast, and on target normally wins, by incapacitation or withdrawl of opponent(s), then analysis follows as such.
That being side, the .45ACP generally comes in a more concealable package with lower muzzle flash (for low light engagements), faster rate of fire/reload, and greater quantity per loading of the pistol. Thus, as long as you have no personal objections... statistically, the .45ACP is a marginally superior chambering.
However, if you can't shoot for crap with a semi-auto frame but can't miss with a revolver, well.... your choice of the .357 is not as inferior, given concealment accomodations and practice, as the .45ACP