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Legend's manga's the canon one, and I enjoyed it. Haven't touched the anime of it, though, for no reason other than the fact that it has a different, ultimately noncanon story. Maybe one day, though.
SIGN is my favorite of the anime. As a kid, it was hard to get into due to the pacing and focus on characters. But I rewatched it about a year ago and loved the hell out of it for the same reasons, it made me wanna go back and play the games (and I did. As a kid, I only got to the end of volume 2 of the original games. This time I got to 4).
I'm really hoping they HD/remake G.U., though. Probability isn't high, but it would be a godsend. Or an anime. It'd definitely be better than the "meh"-fest of a prequel, Roots.