Wiliams is definitely not a Leary-type who can overwhelm opponents with his strength/girth at the POA, but he can physically dominate opponents with how quick/nimble he is which allows him to get into opponents quickly with leverage. He is also very aggressive and has a nasty streak.
Leary had much longer arms (34+) compared to Williams and was just a thick, wide body that was difficult for opponents to get around. Williams is much leaner but he is also much more effective at getting to the 2nd level and in space, and he is very smooth at climbing to LB's on combo blocks on zone runs.
Different types of players for sure but I think ultimately Williams will be a better player in general assuming he can add about 10 lbs without losing his agility/quickness.