Generally a Deep frame has the hinge point and locking bolts between the barrels it should be stronger but because the pin is split this is not the case.
A shallow frame gun normally has the hinge pin under the bottom barrel also the locking bolt plus some extra material to cover this also a deeper forend the only deference you will really notice is that one needs to be opened further to load, wight is pretty much the same other things being equal. Go with what you are most comfortable with.