Career advice needed - AM IR/Sales support, or F100 Marketing

Hi Guys

I would like some career advice here, potential and realistically which would be a good choice to take (objectively).

Currently interviewing for an AM (12BN AUM) in London that is starting a fund in a new country. They need someone IR, Sales support in the home country just to have language / and coverage.
I suspect initially will be more support type jobs but with room to lean and grow into BD and IR / fund raising?

Another role is a F100, well known US Financial services firm, Marketing head role for a specific Asian country.
I will oversee some projects and budgets etc...

I understand that London comes with prestige and upside to $ and all that and lifestyle etc.
The other role will give me a title, head of something :) and perhaps more enjoyable as a job.

PS> I am in my 7th year in my professional working life after college so Im not just starting out as well.

Also thinking of B school in the US in like 2-3 years when i am in my early 30s.

Thanks