I have one of each and I love both! Both of them are equally attached to me and kissy and cuddly. I have heard that boys tend to cling to women and girls to men, but I don't think that's the 'rule' — it varies from puppy to puppy, they each have their own personality. Some have a problem with the boys marking around the house — I've never had a problem with this though.
Whatever you decide to get, I can promise you, you wont be disappointed. If you're really torn, get one of each