To answer, in part, I'll point you to a couple of other threads:
- Nutshell Comparison
- Member Feedback
Also, PhotoPlog currently allows only GIF, JPG, PNG images via use of the GD library. If ImageMagick or full multimedia support is important to you, then PhotoPlog probably isn't the gallery for you.
On the other hand, PhotoPlog IMO has better custom field support, there is the lite version on vBorg for those that want to check it out, and
these features are in the works for the next release.