Put them both on the smoker at 250°-275° at the same time. If you wrap them both at about 160° IT, they will finish in the 8-10 hour range.
I've started cooking both of them the same way. Put rub on them and onto the smoker. At 160° or so, place them in a pan with beer and cover with foil. Continue with cook until they hit 200°-205° IT, pull in the pan with the liquid, sprinkle on more rub, drain off any excess liquid, eat. I don't worry about letting juices settle because it is already in a liquid when you are going to pull it and it isn't going to dry out.