Arnold was a bit underrated imo as an actor. I always believed what the critics said about him, until I watched him opposite Jamie Curtis. He actually did put quite a bit of emotion into his roles.
Sly speaks the way he does because he was removed from his mother's womb by the use of forceps, btw. He was not too shabby in "Shade". He seems to remind one a bit of old Hollywood.
Still, I'd go with Arnold. He can make one laugh.