If you buy a hammerless, alloy framed .38/.357 you'll find that the light weight is NOT condusive to firing .357 Mag loads. Even the steel J-framed sized guns are a handful with a 158gr .357 load. Stick to lighter bullet weights (i.e. around 125gr) or stick with .38 special +P.
The aluminum framed .38 special guns are not generally rated for a constant diet of .38 +P loads. Scandium framed guns appear to be sturdier however. Check the owner's manual.
Most folks who own lightweight/alloy framed gun shoot a standard .38 special load for practice and carry a +P or JHP load. The caution, of course is to fire a cylinder full of the carry ammo to establish it's different POI from your practice ammo. This may seem like a moot point at short ranges, but it really does make a difference.