If you're looking for the best transfer, compression wise, the Korean R3 is the way to go. The R2 Japanese has a little bit more compression artefacts ( mainly around edges ) but some prefer the colors of that DVD. The US DVD is good but the whole transfer is a bit blurred. Lines that should be thin are thick compared to the Jap and Kor DVDs.
Try this thread from Anime on DVD: http://forums.animeondvd.com/dcforum...mID2/1825.html
and this page comparing the various DVD editions: Link Removed
No images from the US edition on this page. Some discussion of the different transfers in the AoDVD thread.
Have fun.
ErikN