Yeah I would defo go for Cambridge over oxford, if you're set on applying for one of them.
This is primarily because despite your excellent GCSEs, the fact that they look at percentage A*s is going to hinder you - and you don't want to fall at the first hurdle as you only have 4 choices!
Would recommend acing your UKCAT and defo looking at Gcse heavy unis as your other 3 choices.
BMAT is quite unpredictable, harder and is all the way in November - quite risky to have more than 2 BMAT Unis tbh
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And actually passed?