PE Megafund or MM bank?

Hi all, 

I am currently working in a MM bank doing buy-side in syndicated leverage finance. We buy to hold, perform credit analysis and we are a small part of the market. I like it here.
A recruiter contacted me for a role in a PE megafund, which is in their private credit arm in the team that will NOT originate the deal and will exclusively monitor the performance of the credit and update projections.

initially, it seemed like a no-brainer, I had to try for this new opportunity, but after thinking about it, I am not so sure. Yes, the megafund would do wonders to my CV, pay would improve quite significantly, but will I get pigeon-holed in a role that is not necessarily my ideal role, since it is quite "passive? what would you guys do/ consider?

thanks monkeys