The worst movie directed by Alfred Hitchcock was “Juno & the Paycock” (1930) since most of it takes place within a single setting plus the story’s pacing is slow as fuck (not until the end that the plot evolves). The best one he directed for me personally is “Strangers on a train” (1951) since the acting is good & engaging plotline. Other ones that are also good are: The Birds, Vertigo, Psycho, North by Northwest to name a few.
North by Northwest and The Birds are my two favorites, NXNW for the epic scale and Bernard Hermann’s soundtrack, and The Birds because it’s creepy as fuck. I also really like Rear Window. While I’m not the biggest Jimmy Stewart fan, the story and the set design are amazing.