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If the wheel is corroded and or the existing coatings are chipped where tyre levers have been used then all that will have to be flatted down
Powder coaters will generally blast the wheel with some abrasive media to key the powder coating finish. It will require prior removal of the disc rotors plus removal of and replacement of the bearings (generally best done afterwards to prevent damage to the bearing housing by the blast media or incursion of powder coating). The bearings will be full of the blast media and the seals will be heat affected (and removal of the tyres obviously).
With spraying, you can get away with masking the bearings and using business cards forced between the tyre and the bead you can even leave the tyre on.
Powder coating involves quite a lot of heat for a sustained period, personally I would spray them because the paint finish is repairable and I do not know whether the heat will affect the strength of a cast wheel
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