OG Version: 1989 US Image Entertainment LaserDisc

2005 Edited Version - Re-Edited and Censored: UK Warner Bros Blu-ray

2005 Edited Version - Uncensored: UK Warner Bros DVD

Film Whisperer's restoration is better

Germany Plaion Blu-ray with uncensored cut and 4:3 version

OG Version: 1989 US Image Entertainment LaserDisc

2005 Edited Version - Re-Edited and Censored: UK Warner Bros Blu-ray

2005 Edited Version - Uncensored: UK Warner Bros DVD

Film Whisperer's restoration is better

Censorship changes for Blu-ray: https://www.movie-censorship.com/report.php?ID=224122

2015 Lionsgate Blu-ray 

• 2015 Lionsgate Blu-ray (but it's missing the extra scenes in the Ultimate Edition)

• 2017 StudioCanal 4K Blu-ray and subsequent 4K Blu-rays are notorius for being heavily denoised and smoothened. Alternatively, 35mm scans for the theatrical cut is also available.

• For the Ultimate Edition with the T-1000 searching John's room and the happy future ending, the 2009 Skynet Blu-ray, which is the older pre-2017 transfer, but has DNR.

• Original Kodak/ORC CDS mix:  Japan Pioneer DVD in DTS/ac3 5.1

• Original Dolby Stereo SR: USA Widescreen LaserDisc and others.

differences of mixes on various releases: see thread and more info here.

2017 Blu-ray (which has the DNRed transfer), the 2009 Skynet Edition Blu-ray, and the 2000 Ultimate Edition DVD have exclusive extras. The 2003 Extreme Edition DVD has some exclusive easter eggs.