Botique IB vs Research Firm. Advice Please

I am looking to get some advice from people that are actually in the industry. I have an offer from a small research company for a summer internship and its paid. I also have an offer from a small boutique investment bank about 20 min from my home. The only bad part is that its unpaid.
I want to get into IB and currently don't have an notable internship. I am a first year MBA student at a fairly good school (not top tier), is the unpaid internship worth doing to learn a lot about IB or take paid internship that is in research not IB, and try to network my way in to IB with a paid internship later. Hoping to get full-time IB offer later after graduation. Looking for some advice