When I was making a similar decision, apart from having an great customer experience from buying Precision Dogs, one other thing that swayed me was that the Precision version is attached using thumbscrews, which makes them easy to attach and remove. In the instances the saw needs to be plunged deeper these can get in the way, so they come supplied with some screws as well. The Seneca version doesn't come with thumbscrews as far as I know.