Because it is a "Complete" disc, it requires significantly more space than a compressed MKV file.

on how to remux this into a 3D MKV for Plex or Kodi.

COMPLETE BLURAY (Full disc structure including menus and extras) Video Type: 3D MVC (Frame Packing) Resolution: 1080p Group: SharpHD

Current for the official 3D physical disc. Which of these would be most helpful for your setup?

This is a reputable release group known for high-definition Blu-ray "untouched" copies. Their releases are typically verified for structural integrity.

Unlike a "3D Rip" or "Remux," a COMPLETE release contains the original ISO folder structure. It includes the original menus, all audio tracks (DTS-HD MA, Dolby Atmos), and bonus features.