I’m in the minority here, but if you grew up with VHS or Laserdisc, I’d highly suggest the JawsTDS Return of the Gout releases. IMHO, it’s the highest quality “Official” version you’ll find (upscaled, but a single source).
For fun, you can also check out Hal9000’s Special Edition audio (cut to the theatrical length) which are absolutely beautiful. (Personally, I prefer the GOUT RotJ audio, but only because it sounds more similar to the SW/ESB mixes. The RotJ SE audio is much cleaner/sounds digital in comparison to the other two’s analog twang).