Stay at Search Fund Internship for More Real Work & Improve Connection W/ Boss? Or Start Boutique IB Internship?

Hi everyone! Looking for some advice. I’m an incoming sophomore at a top 50 non-target striving for a BB IB internship my junior summer. So far I have a 3.8 GPA. 

Currently for my freshman summer I’m interning at a search fund. My bosses told me I’d be working until August 30th but told me “we'll check-in mid-summer to see if you want to continue working that long”, so I can end it if I so choose. 

I’ve been working at this internship for two months at this point and am wondering if I should continue this internship for the whole summer or end it this week and try to get a boutique IB internship for the remainder of the summer that would run into the first handful of weeks of my sophomore semester. 

I’m inclined to stay for two reasons: #1: My two bosses are great, they basically told me "if there's work you specifically want to do for the experience just let us know". Obviously search fund interns do mainly sourcing and I want to ask for more responsibility to have some talking points for BB interviews. #2: One of bosses was a IB summer associate for Evercore and I believe one of my fellow interns a year above me got an IB SA internship with Evercore for his junior summer thanks to her pushing her resume (may be wrong here, I’ll have to ask the intern. not sure if my boss would have any power). 

So my question is: do I stay at this search fund internship to take on more real work and strengthen a connection with my boss who may have power to push my resume at a BB firm? Or do I cut this search fund internship short and begin a boutique IB internship? 

(May be worth mentioning I work 50 hours as a manager of a department at a private golf club in my hometown this summer. If I somehow networked my way into a boutique IB internship, do I have any say in the amount of hours I work/what days I work, etc.?)