If you go to
www.winchester.com, they've got a ballistics table that gives you velocity and energy for various pistol cartridges at ranges out to 100 yards.
A 158 gr. .357 Mag has about 535 ft lbs of ME and 428 ft lbs at 50 yards.
A 230 gr. .45 ACP has about 396 ft lbs of ME and 363 ft lbs at 50 yards.
Barrel length will affect this data. I'm not sure what length of test barrels they use.
I would think that a Kimber would have a slimmer profile and be more readily concealable than a revolver, particularly if the revolver has a sufficiently long barrel to take advantage of the magnum loads.