Hello Jerry!
Both are accepted for 501st membership. And yes, out of the box I think the efx/mrce looks better. Both however require mods if you really want it to shine. I'm not even sure the FX-helmet can ever look truly great. The FX is not accepted for EIB applications, while the efx/mrce is, with the mods. If you're looking for a really good and cheap helmet, I would look for CAP-W or ATA instead, as these are screen accurate. You would however need to put it together yourself. But that applies to the FX-helmet as well.