Bass over Leon with the way our team is currently constructed. Leon over Bass if Perkins were still our center.
Non injured Powe fills many more needs for this team (and last year's team) than Bass. Powe was a dominant offensive rebounder and a foul-drawing machine.
The reason why I'd take Bass is because he maximizes Pierce, Terry, Bradley, and most importantly Rondo. The spacing between KG and Bass means everyone who can put the ball on the floor on the wings has a much more open runway. If we're gonna give up bulk and size we've gotta be able to make them pay.
The reason why I'd take Powe as a bench starter is the same reason Kenneth Faried is one of the most underrated players in basketball. Some guys play with an infectious ability to energize the guys around them, and Powe brings that, Bass doesn't.