rca bnc the same to me in digital app. rca verses xlr is a differ like on amp ,pre, and so on.xlr good for long run of wire.they are two diff monsters as in connection app.xlr locks bnc locks,wbt rca locks .you should have a talk with your friends about why they cost so much.like does a 1500.oo rca cable sound better than a 99.00 xlr cable..lol
