Are you asking for a 'technical' answer, or a 'how to handle my wife' answer?
For the latter, I'd go the kite, probably costs twice that of a board, gives you a fall back position back to the cheaper board if the kite doesn't fly with the missus. Plus if you get either now, then want to get the other later it's probably a better position to fight from.
Disclaimer: I'm 36 and never married, so don't take wifey advice from me. There are others here that have to beg their missus for new gear that can offer better, informed advice