I really like these comparisons like Dumars one, especially. But I think the one person that reminds me of Smart is Ron Artest. I think that Marcus resembles a smaller, guard and less insane version of Ron Artest.
Their similarities are on being able to guard and play multiple positions, high motor, unselfish players who are good/above average passers, bully to get to the rim, aggressive, intense, big for their position, not the most athletic (not slow by any means) but stronger than most at their position, lockdown and physical defender, not great but capable shooters and better used as complimentary scorers.
The main differences are that Smart seems more mature, less of a headcase and a better leader/teammate.