Ads Factory or Ads Manager. Both have their strong points and weaknesses.
Ads Factory claims to be an out of the box solution, and for the most part this is accurate.
Ads Manager on the other hand seems to be more of a base program where you can use extensions to customize it to your taste. The developer seems to understand that you are going to want to modify
the program and has taken great efforts to allow you to do the modifications yourself.
Ads Factory is built on the "smarty" template system. If you are wanting to customize the program, you'd better know what you are doing. It seems they feel the program is fine the way it is and if you want to make changes to it, you are free to do so or you can pay them to do it for you.
Both have support forums and they seem to get a lot of repetitive questions. Its unstandable, both developers seem a bothered by that. Ads Factory will tell you in a few hours you
should have checked the forum, where as Ads Manager it will take a few days for a response if the issue has already been covered.
Ads Factory has one very big advantage over Ads Manager. It is easy to customize the out going emails. You click on settings, mail settings, and select from a drop down list the e-mail you would like to modify.
Ads Manager currently doesn't have this feature. It may be possible to change the emails in Ads Manager but as of this writing I still have not figured out how.
If you are on a tight budget like I am Ads Manager is probably your best bet if you can live without being able to easily modify the emails.
If you want an out of the box solution or are already a savy smarty developer or would rather pay someone to modify your site for you then Ads Factory is for you.