Early on, he played the signature 12's Ovation made for him...except the first one ( you can read about it here
Of course, when Charlie made it for him, he preferred the Bluebird and later on, the Hamer on stage. The only reason he may have left the Bluebird, was when it was damaged, Jeff had Hamer customize his 12 to the specs of the Bluebird (neck, Ovation bridge).
I have seen him with an Adamas 12. But really, once the Bluebird was designed, that is typically what you saw him with, then the Hamer...