I think this deep game theory says we should call as the only hands we really feel like getting in here are sets, and we have those too little of the time (especially because we threebet pre). He has a sick advantage on this board and he probably thinks this as well (oh look i can rep a set).

That being said I cant imagine him raising anything here but a set and like AA-99 (maybe, unlikely) or a total bluff (even given reads). I like calling best because a lot of the time he's not firing three barrels as a bluff and we can get extra value when we hit a flush or two pair and he hits tp or some other pair.