Moelis vs Citi (London)

Hi, I've received 2 summer internship offers - 1 is for capital markets origination at Citi, and the other is generalist (IBD + restructuring) at Moelis. I'm very conflicted on what to choose.
I far prefer the culture of a boutique, and I liked all of my Moelis interviewers.
However, I'm not looking to stay in IB for the long term (looking to eventually go into startups/VC) so Citi's brand name might mean that it's a better choice? Also, all of my previous internships are in smaller firms so might be useful to have Citi on the CV?
However, note that Citi is capital markets and not M&A (if this is particularly important at all). 

Any thoughts/insights?