Boutique IB vs Startup PE?

I interned at a boutique this past spring semester and was recently offered a promotion for this summer. I will be in charge of a few other interns and take on a few more responsibilities within the bank. I also managed to get offered a start-up Private Equity offer for this summer as well. They said they're only taking a few interns and MBAs and that it would mostly consist of capital raising and reaching out to institutional investors as well as the usual search fund type stuff. An important part about this is that the former will be paid while the latter will not. Thoughts?