If Once upon a time in Hollywood was never made, Pulp Fiction would still be his best movie, alas, OUATIH was made so right now it's his best movie.
Such a well acted, funny and with amazing cinematography film, it's just a joy to watch and like most of his films is incredibly rewatchable.
It's his most..."movie like" movie he's ever made if that makes any sense.
Jackie Brown is another good one which unfortunately usually goes unmentioned.
I really don't get how people place Inglorious basterds as one of his best, besides the very nice acting from Cristoph Waltz in the 1st act, the movie is...such tongue in cheek that it becomes a literal meme.
It's funny, sure and it features many meme-worthy lines but a very good film it is not.
The kill bills, now that I'm older I find them to be incredibly edge-lordy.
Death proof , even for a grindhouse feature was gob-shite and shouldn't even be mentioned.
Django was OK and had some really nice scenes but...
Reservoir Dogs will always be a (very) good and enjoyable trashy/cult film.
As for the hateful 8...upon rewatching it for the 4th time, IMO, it just doesn't hold up - it feels ludicrous with the meme-like/joke characters like senor Bob, the always awful Channing Tatum and Michael Madsen's ridiculous dyed hair.
The "who dun it" thing got old fast and Tarantino's own voiceover in the last chapter is just...nope.
One of his most overhyped and overrated films IMO, it's absolutely motherfucking not his best film.