Region 1, because apart from recently ordering a couple of R3s, that's all I ever buy. Plus my copy of TPM is R1 and I want to keep consistency... and you don't have the stupid BBFC rating logo all over the cover.
BTW, you will not be disappointed with the animated menus and Sound/Picture quality of the AOTC DVD. Trust me
I have had my R1 copy on order evr since Play put it on their site, far later than the R2 I might add. The picture quality should be even better than EP1 with the use of Digital Cameras. This film has the promise to be the best DVD ever released. May the Force be with us.