My suggestions?

Snow White. While the restorations are pretty, they are that freaky rotoscope thing which they supposedly did in 1994!? No laserdiscs were made before then. AFAIK there are no releases that pre-date it except maybe some VHS.

Dumbo is a head scratcher. There have been 3 DVDs, none are right, but someone with some advanced color correction skills could probably fix the 60th anniversary release.

Cinderella was pretty much destroyed by the time it hit DVD. The laserdisc isn't awful, it could just be better.

If the screenshots of the 1991 laserdisc of Peter Pan are to be believed, there are colors and detail in that film that have never been seen since.

Lady and the Tramp academy ratio... I just don't know how much interest there would be.

Beauty and the Beast... yeah, probably important. The problem when you get this modern is that it would be best synced to the BD restored audio track, not whatever is on the film.

The Lion King suffered serious reanimation of scenes, possibly worse than BatB ever did. Someone would need to do a LDrip for that otherwise.

Of course there is the question, what versions of Fantasia exist.

While Aladdin has been poked and prodded in the audio department, I've seen screenshots of the EU Blu-ray and it looks pretty much identical to the old DVD.