Top 10, top 20 at worst film for me.
The reason why I think this is the best Lynch film (and I'm a HUGE fan of Mulholland Drive), is that whilst it has all the inherent weirdness and sinister dread of Lynch's other works, there's a grounded reality to it all. There's nothing supernatural or any real ambiguity between dreams and reality. And it's this reality that makes it all the more disturbing. These are real things that could and have happened anywhere. Deep down it's an examination of the weird and strange places human sexuality goes, manifested in Frank. Has a role ever been more perfectly cast than Hopper as Frank?
There's also real emotion in the film. The relationship between Maclachlan and Dern is genuinely heartfelt and pleasant, so it's not just another weirded out, claustrophobic Lynch head fukk. There's real human emotions at play here.
I also love how Lynch messes around with different genres and styles. Whilst this is an '80s film, for all intents and purposes it might as well be a '50s period film. Lynch's use of music is masterful and I love the '50s melodrama vibes throughout. Laura Dern's introduction in the film, stepping out of the darkness into the light whilst the sappy Hollywood orchestral score plays is such an amazing moment.
Film just doesn't get any more satisfying than this IMO.