Tiller wasn't much more successful. Mallory's tenure was bookended by his crappiest seasons, while Tiller hit the ground running. Take away Mallory's first two and last two seasons, and he was 60-46, winning percentage of .566. Tiller straight up was 87-62, winning percentage of .583. Tiller did go to a few more bowl games, including a Rose Bowl. Tiller was ranked more, but finished 7 of 12 seasons unranked.Similar somewhat but Tiller was much more successful IMO. Mallory had 6 losing seasons during his iu tenure while Tiller only had 2. Mallory's record was 69-77-3 while Tiller's was 87-62. Purdue was consistently in the top 25 during his tenure while IU wasn't. I think they're comparable but Purdue was much closer to breaking through to that next level than IU IMO.
Both programs needed another successful coach to follow them and more resources to get to the next level.