ok time for lizard's inner weeb to emerge.
I wouldnt be able to place a single anime as my favourite anime as no anime is truely perfect so i tend to say what trait they are best at however they all are good in the other categories as well
Best Animation: Demon Slayer (Genre: Action, historical)
Best Artstyle: Keep Your Hands of Eizouken! (Genre: Comedy)
Best characters: Anohana (Genre: Bildungsroman)
Best overall story: Rascal Does Not Dream of Bunny Girl Senpai (Genre: Romance, supernatural, character driven)
Best Isekai: The Saga of Tanya the Evil (Genre: iseka