I think both kits use Dayton drivers, but I'm thinking the major difference is between a ribbon or a dome. You really can't go wrong with a Zaph Kit or a Dayton RS build. I personally appreciate what zaph has done for the community and would probably do one of his builds first if I did a kit.I am looking to build one of the speaker systems in the header. I would like to get some feedback from any of you on the forum that have experienced either of these. Also any links you may know of would be greatly appreciated.