Maybe the reason Tom and Jerry are not included is they were a MGM cartoon, not Looney Tunes.
Sorry, when Chuck Jones took the Looney helm, he headed straight for the rocks. Things started getting "educational" and "PC". Fritz Freeling was the genius (one of them) behind Looney Tunes. They were at their funniest in the late 30's to early 50's, after that it started raining crap at Termite Terrace. With the exception of Road Runner, Chuck Jones ruined Looney Tunes creativity.
My favorite would be hard to pick. I love the Abbot and Costello rip off's, ALL the WW2 Propaganda toons, and early Bugs Bunny.