Can I get an invitation for dinner? Sounds like a great meal coming. I think you will find the Primo one will have a different, heavier charcoal kind of flavor and the Traeger will be a lighter, cleaner, more woodsy flavor. It will be interesting on which your guests prefer. For the best flavor on the Traeger, I don't know the capabilities of your modified 070, I would recommend starting the cook on low temp extra smoke setting for 2 hrs and then increasing to high temp to finish it off with a nice crust. I know this isn't equal cooking methods but it will produce the best flavor from your rib roast.