He's ambidexterous. He used to fight southpaw a lot more than he does now. He still switch hits occasionally, but mostly fights orthodox, and I think he's much better that way. But his power (or lack thereof) is pretty equal in both hands.
Ward's a switch hitter like Dirrell. I think he's more comfortable fighitng righty, but in the Kessler fight he fought the majority of the bout very comfortably as a southpaw.
he seems more comfortable fighting orthodox imo. he's sorted out his balance very nicely. looked a bit awkward against Kessler during his stretches fighting as a southpaw.