Of course a diagnosis is important first, yes I call them twitches probably before
motor skills, and both homes sound desirable. Some homes can be retrofitted to meet your needs. Elevators may be an option. Maybe keep both for a while. While you still can, use Hilton Head as a nice vacation spot. Make it an Air BNB
if money is an option. I know I don't sound like the typical real estate agent of 35 years but I wasn't a typical one. I believe you have plenty of time to make up your mind no matter the out comb. Best wishes...