One thing to consider about OEM filters is that someone is making that filter for them. That same someone is making that same filter for others as well--figure out who it is/what options you have may save you some money. Also open the box (whether OEM or your clone) to ensure that the OEM has not changed suppliers to a lesser filter or Brand X hasn't changed to another manufacturer.

Another thing worth considering is that all filters by manufacturer "x" won't be the same design/quality for every application.