[Chomp]

A respected SS poster (can't remember who) recently commented in a SS thread that light/unpredictable 3 and 4 betting/calling/raising has become so prevalent that maybe the best way to play in 3/4b situations (that is, when making them/calling them/raising them) is to play them vanilla white...in other words, at our levels, it may not serve us much better in EV terms to play/assume anything but classic 3/4b lines.

So applying this theory to OP's question here, it would suggest sticking with the presumption that 3b calling ranges from relatively sane opponants are standard until you have a strong read. Sometimes you will be right, sometimes you will be wrong, but it is hard to imagine losing a massive amount of EV if we keep it simple: {AT+, TT+}, or whatever.

Obviously, this theory breaks down against droolers.

Dunno if I have the poster's argument absolutely right, but something along those lines.