Try out the galleries for yourself the difference is apparent.
The Ip Gallery Platform is completely intergrated with Ip Board and I mean not just in terms of themes but also in terms of using the Ip Boards templating system and the same multi moderation and posting features that the forum has.
Where as Photopost is not as well intergrated for example the postbit is completely different to vbulletins as it is not only designed for vbulletin since it suppports other forum boards too even Invision Power Board itself.
There is Photopost Vbgallery which attempts to intergrate with Vbulletin in terms of being a plugin but still doesn't have the kind of intergration that Ip Gallery does.
I personally tested the galleries out myself
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