I like them both, although I'd never use either because I intend to use
Jean for a girl. I prefer
Sean to
Shane, for the same reasons as Chazda prefers them the other way around!
Shane sounds a bit more "blue-collar" to me and I come from a "white-collar" family. I also just prefer the sound of
Sean over that of
Shane. However, I have a good friend and mentor called
Shane who's just finished his PhD in archaeology so it *is* special to me.
:-)