Help me decide: IB or PE mentor?

I'm in the process of applying for an EMEA mentorship program which (talking to different people) I have a very good chance of getting into. The application process allows me to choose only ONE line of business for the mentor I'd like to be paired with.

Here's the deal: although I'd like to work in IB, that is only (as I assume many do) to later pivot to PE. This means that by expressing a preference for an IB mentor, I'm going to skip a PE or MBB one (I know people who got paired with partners at an MBB). 

Considering how IB is in EMEA right now and the overall high-finance job market, what would be the best choice to make in this regard?

Please consider that I'm a VERY non-target UG and that, God willing, I'll join a target MSc this fall.