Well, I've owned a 1/48, a VF-0S first and second edition, and a YF-19. And I have to say that overall, the 1/48 is the best I've had so far.
It appears that it's still Yamato's best effort to date, though I haven't got the YF-21 in my hands yet. And I've never owned a SV-51 either.
-Kyp