mountainx

Can someone please help me choose the 3 strongest out of these 5 letters? All are my research advisors and are ranked 1-5 from current advisor (1) to oldest former advisor. I added a Xth non advisor to the running as well to the chronology. I have letters recently written from these folks for other related purposes so timing is not a huge issue. 1) (definitely including) Notable Professor, important in the field, top university (2+ years of full time work here) X?) Professor in my area of interest who taught me (pretty recently) in a class and I keep up with him 2) (I would like to include this one) Industry advisor in a biotech company, high level and an affiliate assistant professor at a university (6 month full time here) 3) Industry advisor in a biotech company, presented a poster related to this project (6 month full time here) 4) Professor at a state university, summer internship advisor in by far the least related research area of all other letters to areas of interest (1 summer full time) 5) Professor at my undergrad institution, early undergraduate part time work (small time committed) I am slightly worried that some of my more recent work was in industry research labs and industry letters might be received less positively than Professor letters (which I have the ability to send but represent my capabilities years ago). I am very very appreciative for any help I can get in this!!!!