I use both - on separate forums. In my opinion, Photopost is the best one but it's commercial. If you don't want to pay then use 4Images.
Photopost appears to integrate better with vB but there are hacks available for both here. Photopost will use vB's stylesheets, and the user database and permissions. 4Images uses the user database, and will copy the user groups but when a new user joins, you have to manually modify their groups in 4Images which is a pain (unless I've missed something in the setup). It could be because both my galleries are members only.
4images does it's job, it's free, it doesn't get updated often (which is either a good thing or a bad thing depending on your point of view).
I don't have any cpu problems with either of them.
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