No Name Small Cap M&A or CorpDev M&A?

Talking about an internship at a small cap M&A boutique (average deal size is 1-50 mil €, think 3-4 deals a year) versus an internship at a big corporate in their M&A department (firm makes 3-4 b € in sales). Final aim is to break into a BB/EB next year. Which one is better on the resume? (EU)