PS Audio Power Ports are isolated ground. I haven't tried them so I can't say if they're better than the Hubbell I/G's that I installed in my former residence (my system was dead quiet). My opinion is that the isolated ground circuit will provide benefits on a greater scale than between the name brand of (quality) receptacles. The isolated ground circuit can cut down a lot of RF interference noise from getting into your system - something that no receptacle can do.
Right now I have moved to a house where I can build a 30 by 16 listening room. It's a down to the studs gut job with acoustical and structural redesign. I am redoing the entire house electrical system and running the audio circuits in metallic tubing to metal receptacle boxes in a twisted pair/concentric ground configuration. The circuits are definitely going to be isolated grounds and will purchase the best I/G receptacles I can find; that's my priority - I/G first, name brand second.
Right now I have moved to a house where I can build a 30 by 16 listening room. It's a down to the studs gut job with acoustical and structural redesign. I am redoing the entire house electrical system and running the audio circuits in metallic tubing to metal receptacle boxes in a twisted pair/concentric ground configuration. The circuits are definitely going to be isolated grounds and will purchase the best I/G receptacles I can find; that's my priority - I/G first, name brand second.