I cannot choose an actual favourite TV show of all time. There are the big names that get dropped constantly (The Sopranos, The Wire) and while I really love them, they don't have that special something that Atlanta has.
Four seasons of relatively short, mostly funny but occasionally poignant shows. Usually episodic, but occasionally we drop out of the main story and get a standalone short film that is completely unrelated. This same trick is also used in Master of None, and I really love how an established show and platform can be used to create and distribute these short films that might otherwise never get made.
Also: I have said it before, but LaKeith Stanfield makes everything he appears in at least 10% beter.