I hated Artie Lange when he first started. I thought he was annoying and not funny at all. He got better over the years; I think he has a knack for making short improvised comments; but not by much. He’s just generally not that funny to me.

Jackie Martling was definitely funnier, but mainly because of the way Howard and Robin used him for the show. Them ridiculing him and his “wacky” ways with their caricatural impersonations made for some of the show’s funniest moments.
 

Dave Hollander :

Artie was funnier but Jackie was a funnier subject. I.e. the gang doing Jackie noises and making fun of him.