Imo it has to be prx. They seem ready to play almost any map and it’s not like they are avg on them either, they are damn good.
Close behind prx I would say optic. They are willing to play any map. They have had some recent struggles on icebox however they are willing to play it (guild game). They seems extremely good on almost all of the other maps.
I think fpx is behind optic as they have shown they are willing to play any map however against stronger teams they have been consistently banning bind.
Out of the remaining teams I think fnc has the worst map pool. They are one of the only teams to have a perma ban map (breeze) and they are painfully average on both split and ascent. They have also looked recently shaky on bind.