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Before I started Xoopsing, I used 4images standalone and was very happy with that. I never could get XoopsGallery to work. I never could get it to recognize where ImageMagick or netPBM were located, no matter what I did, even with my hosting service trying to help.
I'm using xcGallery now, which installed flawlessly and ran well from the get-go, and it seems to be pretty smooth so far. My users are happy with it and report no problems. But if I ever have any problems with it I will probably go back to a standalone like 4images, or whatever else might be around at the time that works well.