The best loads in each caliber, from full length barrels, should work about as well. In short barrels, I think the higher velocity of the .357 is a real plus since the .45 operates at much lower velocities. As barrels get shorter, the .45 may not be as reliable of an expender when heavy clothing is involved. Modern ammo is much better than that of the past so poor expansion doesn't seem to be as big of a problem as it used to be. Also lighter bullets, such as 200 and 185 grainers, can give snub .45s the velocity boost that they need .

The .45 generally will produce bigger expanded diameters, whereas the .357 generally will have more energy and some loads throw off serious secondary fragments.

As a service cartridge, many prefer the more powerful 125 gr. .357 offerings. I certainly do. Hot 125s should be good for over 700 fpe. from a 6" gun.