I can't necessarily claim it's the best, but I enjoy my RSC Complete Works. It's divided up into Comedies, Histories, Tragedies, Poems, and Sonnets. It's based heavily off the First Folio, so there are a few more uncommon editing choices. There are also essays before each play that elaborate on the themes and complexities of the work, and very solid summaries/character info/etc. for the plays.