Hard to say. Depends how and where it'll be used.
Inside to run via a catch can vented to atmosph with a long hose under the car, but Bill noticed some oil splatter on his windscreen after owing me on track.
I switched to a plumbed in system back to the intake, and annoyingly it now STINKS after a thrashing, and I've had one or two issues with my setup as the dv return ive tee-d into is too close to my maf.
I'm looking to change back to a VTA system with a can with a filter on top, but I'm expecting to still have the smell issue as it'll be able to vent fumes under the bonnet.