I've seen all three and the best by far is Treasure Planet (1982).
Although, Son of Alladin is kind of a treat. The story isn't terrible, it's got some charm, but you can't watch a scene without busting a gut over the animation. Everything looks like a pre-rendered cut scene from the Playstation 1 and there are some scenes that use actual stock photos as background.
Ah yes, Bulgarias attempt at Treasure Planet was a gem indeed. A little fact to keep in mind should anyone watch it, the director went on to teach at CalArts!
https://www.youtube.com/watch?v=iBd6qsUJ5SQ
"Ali Babba and the Golden Raiders" Has to be one of my favorite Aladdin knock-offs.