With multiple sources within each tier treated equally.
The general thought process is more about the site disappearing so the focus on sources makes more sense and transcodes can be created trivially if needed for a theoretical new site as needed.
With the IA this is unlikely to be an issue as they'd just want to make sure each torrent has seeds so no real need for prioritization around sources.
UHDBD > UHDRemux UHDWebRip > HDBD > HDRemux > HDWebRip > DVD9 > DVD5
With multiple sources within each tier treated equally.
The general thought process is more about the site disappearing so the focus on sources makes more sense and transcodes can be created trivially if needed for a theoretical new site as needed.
With the IA this is unlikely to be an issue as they'd just want to make sure each torrent has seeds so no real need for prioritization around sources.