Best overall: Warner standalone 2 disc release. WB remastered from highest generation available and includes extras. Sadly there are some audio glitches that were still not addressed for this second release.
Bosko Diamond collection: second best for PQ, generated from 35mm prints. Great overall with no errors but each feature has the release date stupidly superimposed on its opening.
Image DVD: early release that merely reissues their laserdisc transfer. The good news is that the mono is in PCM.

Currently there’s an old tread about working with these in the other preservations forum.

Best advice is go for the WB set which is dirt cheap on eBay. Then if so inclined get the Bosko. Also the WB transfer is on all the Superman film sets from 2006 onwards but lack the handful of fixes hey applied for the standalone reissue.

There is no word yet of an official HD release, and the folks at Warner Archive confirmed this for me.