ZenPhoto or Gallery for Joomla



I am fairly ignorant when it comes to adding extensions to Joomla. I am wondering if I could add a subdomain to my domain which is using Joomla and in that subdomain install either ZenPhoto or Gallery.
Is that a good solution or a bad idea?
I am already using PonyGallery with Joomla and don’t like it.



Do you want it to be embedded, or completely separate?

I tend to give it a subdirectory unless I really want it to be a separate site.