Take your song to a professional and ask him/her. Try both dances and see what works best in the time you have available. Both of you have to dance together and if one can't get the basics down and on beat, it really doesn't matter which dance you choose. I wouldn't worry too much about it. Unless your guests are dancers, no one is going to notice the mistakes. Just don't look down at the floor, which when filmed (and it will be!) makes it look like you are staring at his crotch and him, at your chest.