Oxford or Cambridge Medicine for me

I am in Year 12 and want to study medicine.
Ive recently heard that Oxbridge considers 8s and 9s as the same thing (consider them in terms of A*). Ive got 7 9s, 1 8 and 3 7s at GCSE which is below the average number of A*s Oxford accepts. I want to apply to Oxford as they take in more of the interviewed people but I am nervous that I may not get an interview because of my GCSES. However Im predicted 3 A*s and have a lot of supercurriculars to mention on my Personal Statement. Should I apply to Cambridge to secure an interview or risk applying to Oxford.

These grades are good enough for Oxford, if combined with a high score in the UCAT.
However, as I'm sure you know the UCAT has been changed this year, taking the total score from 3600 to 2700, so it will be impossible to tell what a high UCAT score is until the deciles are out. They used to accept around the 3000ish scorers, but that will change drastically this year, with obviously a whole section gone and more questions/time for the other sections.
The thing is, Cambridge give out many interviews, but actually offer few places, compared to Oxford where if you get a high UCAT and get an invite to interview, you'll have a much higher chance of getting in.
Best of luck!

Thank you so much, so you recommend going for Oxford?

Yes, I would.
I'm a Scottish student so I'm making the decision to stay in Scotland for free fees at medical school, but if I wasn't I'd definitely apply to Oxford. The grades here are also a bit different and they aren't always understood too well so they wouldn't have much to give me an interview on apart from whatever I get in the UCAT and maybe personal statement.
Best of luck to you!

Would you say people are invited to interview by competitive universities (Oxford, Cambridge, Imperial, KCL and Edinburgh) largely due to a high UCAT score? For example, if an applicant had maximum GCSE grades (all 9s) and maximum predicted grades (4 or 5 A*s at A Level or 45 points for IB) but a lower UCAT (let's say 2800 or lower), would they be less likely to receive an interview invite than someone with a very high UCAT (let's say 3100 or higher) but lower GCSE grades (only a couple 9s, mostly 8s and 7s) and lower predicted grades (A*A*A for A Level or 41 points for IB)?

Would you say people are invited to interview by competitive universities (Oxford, Cambridge, Imperial, KCL and Edinburgh) largely due to a high UCAT score? For example, if an applicant had maximum GCSE grades (all 9s) and maximum predicted grades (4 or 5 A*s at A Level or 45 points for IB) but a lower UCAT (let's say 2800 or lower), would they be less likely to receive an interview invite than someone with a very high UCAT (let's say 3100 or higher) but lower GCSE grades (only a couple 9s, mostly 8s and 7s) and lower predicted grades (A*A*A for A Level or 41 points for IB)?

Would you say people are invited to interview by competitive universities (Oxford, Cambridge, Imperial, KCL and Edinburgh) largely due to a high UCAT score? For example, if an applicant had maximum GCSE grades (all 9s) and maximum predicted grades (4 or 5 A*s at A Level or 45 points for IB) but a lower UCAT (let's say 2800 or lower), would they be less likely to receive an interview invite than someone with a very high UCAT (let's say 3100 or higher) but lower GCSE grades (only a couple 9s, mostly 8s and 7s) and lower predicted grades (A*A*A for A Level or 41 points for IB)?

Most of the unis you've listed sadly will want both high UCAT and GCSEs (except Imperial and KCL maybe, not as sure on these but thinkt they are more UCAT heavy). Most unis don't care about predicteds, only that you have the minimum ones.
Your GCSEs are quite competitive so it's UCAT to worry about now. There are med schools who score GCSEs more than UCAT (QUB, Cardiff etc.) and ones that only care about UCAT like Bristol. Oxbridge in the middle but ideally want both to be high.
I know it's difficult, but try and refrain from having your heart set on a high UCAT uni. I got lucky but I know it would have been gutting if I hadn't performed as well considering I had my eyes set on Oxbridge. The reality is, even with a high UCAT many capable applicants get rejected every year. Revise well for UCAT next year and try your best, but remember these competitive unis aren't the be all and end all.

I wouldn’t recommend applying to Oxford or Cambridge until you have sat the ucat.
These year 12s underestimate the ucat way too much. Even if you got all 9s at gcse, it doesn’t mean you’ll be good at the UCAT.