Which image/gallery solution did you use in the end?

The question is: what image or gallery solution did you end up using in the end?

I use zenPhoto on one of my main sites and Flickr on another, but since I’ve recently started working on a site that will largely be managed by people who are more content-focused than tech-focused, I am now trying to figure out what would be the most straightforward interface/solution for them to use.

Instinct says to use the default WordPress, but I am not sure how much flexibility it offers (e.g. image editing/rotating/watermarking etc) even though it seems like the easiest interface to use for WordPress beginners.

Any suggestions would be appreciated ??

Thanks!