Very interesting. Since breaking up I've been pleasantly surprised because both men have shown a great deal of charisma tha they didn't show in the WGTT. From Shelton teasing teasing Triple H and the intensity he showed when he went after Flair, to every single one of the facial expressions Haas has had in this mini-angle with Rico, both guys have showed a nice little emotional range.
Both of their ringwork is really strong. Shelton is a great athlete and uses it to his advantage and Haas wrestles like a classic heel and the Haas of Pain is one of the nastiest looking finishers in the company. Based on where they're at, Shelton is going to go farther faster, but I think they're both going to end up being stars. These two are going to be mainstays in the WWE.
So my pick at the moment is Shelton, but only because I hate whitey.