I'd say it should be better to take a physical class. Although a great teacher can set up a great course on Skype, I believe that until online courses are kicked off a bit more, you should trust physical classes more. They are more professional in a way. And besides, it'd be reliable since you won't have random disconnections.
*EDIT* TL;DR It's possible that it won't make a difference, or the difference would be a positive one, but chances are the physical class will be better than a class than Skype. Just to be safe, avoid it for now; maybe consider it when courses over Skype are more popular.