The Region 1 release Inuyasha (Vol 1) contains only three episodes and includes character art. The Season Boxsets though (27 episodes per season) are distributed across 5 discs (instead of 9). The Region 2 Japanese release of Vol 1 contains only two episodes, character art and several trailers. Since we get four issues per volume (and there are 167 episodes and rumours of more to come) I'd call Region 4 the clear winner on individual releases. The Region Box Set is perhaps the better option if you chose to buy overseas.