From what I know Contentbox is more extensible then presidecms, is more coldboxy (module extensible), layout management and layout design is more simple. PresideCms integrate a modified version of coldbox if I remember well, however I really don’t like the code, documentation is missing. However presidecms has multisite support that is missing in contentbox. I was trying to create multisite management, but does not have time at the moment and also I’m waiting to the core been converted to coldbox 4.