I've always thought it was a little unfair to directly hold either 'Clone Wars' or 'Rebels' up as being "better" than the other. They both have their strengths and their weaknesses, but they're also both very different animals trying to do very different things. Clone Wars is an anthology show where the only real star, is the setting itself. As such it could tell almost any kind of story with limitless scope and significance. Rebels was an serialised arc show that told more personal stories against a larger backdrop, and the cast were very much the stars. As a result, while Rebels arguably didn't reach the same heights as Clone Wars, it didn't reach it's depths either and consequently was a much more even and consistent show. Clone Wars could be rough at times, but that's what happens when one takes big swings, and you don't get the truly stellar material without said big swings. One thing they both have in common however is that both shows get consistently and exponentially better overall with each season. That to me is the real hallmark of a great show, as opposed to those that start strong, but just sort of tail off over time, or fall apart altogether at the end. Whichever one prefers is entirely subjective. Honestly, I go back and forth.