According to holden,Ackley and stradlater are both slobs. in what way are they different as slobs

Ackley is boorish, obnoxious student at Pencey, Ackley lives in a dorm room connected to the one where Holden lives. He is socially inept and physically disgusting; his complexion is poor and Holden suspects that he never brushes his teeth. Stradlater Vain, self-centered, and arrogant--nevertheless: a "secret slob".