Big 4 valuation vs boutique PE vs F500 M&A investment

Hi guys,

Recently I am seriously considering to apply for a top MBA and thus a bit worried to make a wrong choice on my job offer selection, which i think will certainly have an impact on my MBA candidacy. I have 3 years experience in big 4 audit and I am considering to make a career change. Current plan is to apply for an MBA one year later.

3 options right now but none of them look perfect:
1. PwC Deals advisory (Valuations team) - looks like a safe choice but the downside is I cannot learn deal process
2. PE investment team in a boutique financial group- really a small one, deal size at around 10million usd only but it's true that I will have a lot of responsibilities . There are around 4 funds under management, namely mezzanine loan fund, special situation fund (the PE one) etc. and there will be more funds to be launched in the coming year. No specific industries they are focusing on. I only know that they have gym studios and fire service installation contractor in their portfolio. Main focus is Hong Kong plus USA (just a small portion) markets.
3. Cross Border M&A investment team in listed subsidiary of a chinese conglomerate (the chinese parent is a fortune 500 company) - deal size at around 1 billion usd, but normally there will be only 1 to 2 closed deals in a year. The subsi principally engaged in the tourism & hospitality and logistics sectors. Currently it has acquired companies/properties in Singapore, the UK and the US. I am not sure if the adcom prefers western firms rather than chinese firms.

Appreciate if you guys can give me some suggestions.