SA S&T Advice

So I'm currently faced with the decision of choosing between Guggenheim Partners S&T, Citi Capital Markets Origination, and Macquarie's Infrastructure & Real Assets Group.

Does anyone have any insight into which of these would be the best option for this summer, taking into account things like exit opportunities/career growth, culture, etc

There's not too much out there on Gugg or Macquarie in particular, so I was wondering if anyone had any insight.

Thanks!

Edit: Also, if anyone could expand on what career advancement looks like more long term in S&T (specifically trading) now, given the new regulations and changing landscape, that would be much appreciated.