[Freshman] UBS PWM Internship

I had a phone call with a VP at UBS, and it went great. The VP said he would love to have my on board this Summer, and would get back to me after talking to the people at his bank (he told me it would be unpaid). My ultimate goal is to work in BB investment banking but I do go to a non-target so realistically I just want to work at a boutique investment bank or middle-market since BB is impossible.

I've been reading some older threads, and the general consenus is that PWM really holds no weight when it comes to IB recruiting. There are a couple boutique investment banks near me so should I just hold off on this "offer" (probably a very bad idea?), and just do everything I can to intern at a boutique? I don't want to be unrealistic but I really feel like if I can get the MD to take me on it will make me much more competative.