A refugium that is setup remotely (ie: not part of the sump, but a separate tank) will not become a settling area for detritus. If your fuge is in your sump, then there will be settling and it may be better to return after the skimmer.
Personally, I favor a separate refugium tank that is fed with a pump and allowed to drain by gravity back to the display. If it is stocked with detritivore kits and a sandbed, then the little detritus that is pumped into the fuge will act as a food source to the critters.
"Raw" water will better feed the macros versus water that has already been through the skimmer.