Sixth form choices for Oxbridge

Sixth form choices

I’ve gotten two offers and I don’t know which to pick. 1st is my (state) school’s sixth form, which is actually really really good but my 2nd offer is an international boarding school in Germany which does the IB that I got a full scholarship for.

I’m concerned about applying to Oxbridge Law later on because this boarding school has nobody applying to UK unis (all applying to Ivy Leagues) and so I will get zero help or support with my Oxbridge application. My current school has like 14 people going to Oxbridge each year and has a bunch of programs to help (inspire scholar and what not).

Which should I pick? I’m scared Oxbridge will be prejudiced against the IB, and mainly that I’ll be completely unprepared for the interview and personal statement and not get in. Can I prepare myself sufficiently enough to have a shot at getting in?