Take your friend out of the equation. It is about finding somewhere YOU will be happy spending four years of your life, not about not looking like you're copying your friend for 5 minutes.
Ask for advice in other areas of this site, it really helped me, but ultimately you have to decide what you want from university and where you can get that. Oh, and don't get hung up on trying to find the "perfect" uni - there isn't one, just ones that have more things you prefer and fewer you don't. If you've applied to unis that are really similar in terms of the things that matter to you, chances are you'd be happy at any of them.
Once you've made up your mind, if it is the same uni as your friend, talk to them and tell them WHY you made the choice, preferably with some reasons that are specific to you/the half of the degree they aren't doing, so hopefully they'll realise you aren't copying them.
Good luck with the decision making.