Different concepts with completely different objectives mate.
If you want your baits to last, or become rock hard, air drying is the one.
If you want to boost them, just coat them as soon as they're out of the freezer (they will absorb liquids as they thaw).
You can of course air dry then rehydrate with liquids if you want to completely saturate them (to prevent them from soaking up silty substrates for example) but it's a lot of faff.
Under normal circumstances you don't need to do either imo, and when bites get harder to come by on boiled baits I'd sooner switch to something else entirely rather than attempt to make them more attractive using little tricks.