My two cents...
If your friends are "party animals" you might consider Carnival - I do not recall the Bars closing, where on RCL I believe they do.. Around 2-4 (forget, you can ask - they will just say - depends on demand of that day of course)
Personally I would do RCL over Carnival, and if the ship goes to it's private island could be worth it. Never been to RCL's Bahamas private island.
4 Days in my opinion is a bit short, but for a few single young guys, you will see more of that because it is more "affordable".. Also was it LuLu who said NCL? I have never been on NCL - but they do not have formal dining times so you guys can not worry about waking up to get food after sleeping off the afternoon booze....
Honestly, do not worry - no matter what you pick, your friends will have a blast.
Also consider spring break time or summer / winter breaks - more college chicks 
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