I have an offer for math and physics at Trinity. Since my STEP offer is 1,1 I do expect to meet it. I will likely have the other option of attending Lycee Louis le Grand in Paris for "classes preparatoires", which is the 2 year program after high school to prepare for admission to the "grandes ecoles" like Ecole Normale Superieure and Polytechnique. It is more or less the same material in math and physics as the first two years of the Tripos, possibly even a little more in depth. The workload at French "prepas" like LLG are among the highest in the world (40 hours per week). Louis le Grand is also recognized as the best of the "prepas" in France.
Neither of the schools are in my home country (USA), but school in France is completely free, and Cambridge is $48,000 per year, an obviously massive sum.
I also don't expect too many people here to have familiarity with the French system, and you are probably biased towards British universities anyways being British. But, if by chance you know about the French system, could you give me some advice on where to go?
Some more information:
-Ultimate goal is to get a PhD in theoretical physics from a top American university
-I know French well enough to understand math and physics in French, and have a fluent understanding of spoken French, but I'm not yet fluent at speaking myself. Although I can definitely hold a conversation speaking slowly. This is not a major problem as I will learn French rather quickly after 2 or three months there.
-I have family in Paris in the same neighborhood as Louis le Grand.
-I want to get the best education in math/physics possible at the undergraduate level
Who do you think it is...