Have you compared the two? I think the R3 Alto is superb. The one thing that bothers me about Alto’s release though is, the soundtrack is very low. It’s actually kind of strange the way it sounds. I used to own the R2 Artificial Eye and the music was loud and powerful. On Alto’s release BLK2 remixed the soundtrack and the music is just not right.
Plus the subtitles have some spelling errors.
What really drew me to the Criterion release was the fact that Wong Kar Wai, supposedly, supervised the soundtrack. Not to mention the commentary.