I'm of the extreme minority who prefer OBSESSION to VERTIGO. Mostly because of the incredible Genevieve Bujold.
Some of Hitchcock's more noticeable earlier works are THE LODGER and BLACKMAIL from the 1920s, THE SECRET AGENT, THE LADY VANISHES, THE MAN WHO KNEW TOO MUCH, and THE 39 STEPS from the '30s, and NOTORIOUS, LIFEBOAT, SPELLBOUND, FOREIGN CORRESPONDENT, SHADOW OF A DOUBT, ROPE, and SABOTEUR from the '40s.
My personal Hitchcock favorites are PSYCHO, NORTH BY NORTHWEST, FRENZY, THE BIRDS, LIFEBOAT and ROPE.
Hitchcock's own personal favorite is on record as being SHADOW.