how do investment banks look at internship at Big4?

I'm currently a university student in London (not a top university) looking to break into IB (in London). I have done an internship in alternative investment fund accounting at Brown Brothers Harriman and I secured a summer analyst role at Goldman Sachs in their operations division (in Warsaw). 

I also have an offer from Deloitte for an audit placement at their London office. My question is - should I take it? I know it's not really related to what I want to do in the future but isn't it more experience to be put on my CV? or is the experience I got so far enough to secure a grad scheme role in London in investment banking? As a student I'm trying to get as much work experience as possible but I don't know how IB recruiters will look at the big4 internship on my CV