The Mariah version. That’s the original and I’d still say the best. It’s one of those songs that comes on and everyone goes “ah” when the slow bit is on and then when the fast bit comes on they all dance around like mad in their woolly Christmas jumpers while tryin to get off with their boss at their Christmas party. Not that I ever did that thank god. I’ve added Justin Bieber at the end coz the young people do like him too. Although, I’m not that young and I like him. Maybe that makes me young??