Lots more to consider probably. Are you going with kids? Looking for side trips, golf, water sports or just veg on a beach?
First off, ressies will be difficult at HHI at this late juncture, not sure about VB. Of course you can fly direct to HHI but budget concious folks like flying into Savannah. Charleston is a good second choice.
Plenty of threads on this same topic with good opinions of both places. Either way, you can't go wrong.