I never felt the love for Space Ace as much as I did for Dragon's Lair. Also, I was never good at Space Ace, only playing it a handful of times. It was a lot more complicated than Dragon's Lair as far as knowing which direction to move in. Plus it was all continuous, no individual scenes. Dragon's Lair II took it a step further as far as scenes that flowed together.
If they released either one of these, I would seriously have to consider not getting them unless the achievements were as easy as Dragon's Lair. Plus, Dragon's Lair is more nostalgic than the other two for me. It would be nice to have them release all three games (it makes perfect sense), but I don't know if I would get the other two.