The main thing is he plays with pace. He never stops moving and is always looking to drive forward. Chabot prefers to stand around and wait for the puck to go in our net.
I call it decisive actions. Everything Sanderson does is quick, hard and with intent.
I feel like Chabot too often outwaits his options and ends up cornered. When he stutters or tries to hesitate, it's pretty easy to anticipate for a defender and that's when he turns over the puck or makes a soft play.
On the PP it's night and day difference Sanderson >> Chabot.
I don't know if DJ/previous staff ruined his development but I can say with confidence that Chabot hasn't really improved in any category over the last 3-4 years. His progress as a player seems stalled whereas Sanderson, sky is the limit.