Leading your team to the finals 6 times is more impressive than leading them there twice and bowing out early the other 4. That's not even a question. Would you consider Tracy McGrady to have a better legacy than similar players who made it to the finals and lost? No, that would be idiotic.

Not to mention the numerous other accomplishments Bron has over Dream. You listed MVP as a plus for Dream as if Bron had never won one, let alone 4.