I try to be concise and unwavering about my opinions but I'm really not. Hopefully someday I won't feel the urge to edit this as frequently as I do.
Most of these are fairly interchangeable: I love them all very much. But I'd say that Suspiria (both 1977 and 2018) and Persona are tied for the title of my all-time favorite.
Here's my even larger unranked favorites list: Top 100
Clearly I contain multitudes!