In short, yes, Yamatos are the best.
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Alright, that's just my opinion, but for me, I find the 1/60s and the 1/48s both to be great pieces. I'm more into displaying my Valks, "playing" with them only a little, and so the more accurate scuplts and great detail on the Yammies won me over, right from the start.
For a variable, relatively mass-produced Valk (LE's aside), (IMO) there is no beating Yamato.