To better understand the difference (as for the bed and beyond) take a look at the chapter "Travelling overnight" in the webpage:
Assuming that your group will be the 4 people in the couchette, and that you are friends (!) it really comes down to price. I would personally prefer the 2 person sleeper - more space, better (and proper) beds. But if you want to save money then the couchette is fine. Just be sure to lock the doors in either case.
Thank you for the advice. We are going to try one of each (4-couchette and 2-sleeper). Get a taste of both.
Buy this ticket from www.sbb.ch - (couchettes from €49 & sleeper from €69)
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