I would say Lunar EB was the best Working Designs RPG that I ever enjoyed, hands down. And I liked the extra voice-acting bloopers CD too - I know that's hated-on, but I enjoyed getting an inside look into the creative process of localizing a game. I tried to acquire the first Lunar SSSC, but never got around to it. I missed one opportunity at a Game Stop or whatever, never saw another one, and just forgot about it.
Grandia, on the other hand, I really hate it actually and gave up about, I dunno, 20 hours into it. I tried at least 3 times to finish it because I usually have a policy to beat a game at all costs once I start it, but that is one game so far that I've failed with - I would just get so bored out with it... (Add Battletoads for NES to the list too! I'll have to cheat to beat that one some day.)