Unconditional offer help?

So I applied to Oxford as well as York for Music. I still haven’t heard back from Oxford yet as they are still considering who to give an interview to. My offer for Oxford is AAA however I have applied to York too who have made an unconditional offer for me. I would be just as happy going to York as going to Oxford but I still want to go to Oxford. Should I just put York as my firm and take the unconditional because it would make my life 10x easier or should I put Oxford as my firm (providing I get an interview and am made an offer? And risk not getting three A’s and also losing my unconditional?