CDJapan vs HMV

[Melrose]

I don't know if I should post this here, so if not please move. ^^

My question is:
What are the big differences with HMV, compared to CDJapan?

And I don't mean prices. ^^ HMV is already cheaper for me. I mean:

- Does HMV get first press bonuses?
- How does HMV ship the posters?
(^ because I don't see any poster details on any item.. like Kuu's stay with me; nor "Limited Edition" or "First Press" info..)

Any other differences, please tell. ^^