Bucket mud going rancid after sitting I can attest to. Crack open the lid before you buy it. My local Despot had an entire pallet of the stuff that'd gone bad from sitting around god-knows-how-long, and then tried to give me shit for returning it like 15 minutes after I bought it.

I always use the green lid USG "all purpose" stuff. I am likely inept enough not to notice the difference between that and other options, and it's always done fine by me. I can tell you from my own observation that the "dust control" moniker on the USG blue bucket stuff is horseshit. And yet, it costs twice as much as the normal stuff.