I run both on different TGPs. Comus is definately much more powerful right out of the bag. Meaning, everything you need to do from Thumb Ratings, Integrating Trade Scripts, Auto Rebuilds, Multi-Size Thumbs, and more is readily available. I also think Comus has done a better job at presenting the options in the backend then AGS.
As for AGS, you can set rebuilds just like Comus, it's called using the included cron.cgi, with a little experimenting and help from friends since there is no good documentation for the advanced features, you can get most of the Comus features using go.php and setting specialized categories for different thumbsizes. I really like AGS for its initial simplicity but Comus has it beat with the abundance of features presented all at once. Of course if you're a tweaking person, you can literally add anything you want into the backend or pages generated with AGS since most of the driving script is easily edited.
If you really want to use JMB's scripts, just use TGP Rotator and forget submissions since its more fun to be greedy. The rotator has all the same backend features as AGS minus the Submissions.
