Itou Junji: Collection

Both series are episodic horror series that are both really creative in their storytelling. While the stories can range in quality, the ones that hit are truly atmospheric. 

Same author, bizarre stories, oddities, greasy terror. 

Both are anime consisting of several short horror stories, if you enjoy the episodic storytelling nature of one, you are likely to enjoy the other. 

-both have similar artstyle and creepy music, creepy feeling of mystery And mischevious plans 

Both are collections of horror stories, the only difference being that Itou Junji is not hentai. 

maybe my top horror anime 

Both are horror series with tinges of black comedy (intentional or otherwise). 

Boogiepop Phantom is a loosly collected accumulation of episodic horror stories surrounding the titular Phantom, Boogiepop- an angel of death. Junji Ito Collection has multiple sets of stories centered around multiple monsters that are also episodic. The two are horror, have short lived characters, and have good atmospheric buildup. The nature of the horror with its twilight zone feel is also similar. 

Kitaro doesn't get as dark or as horror as Junji Ito stories do but both still supernatural and spooky style anime  

Both are episodic, while Aoi Bungaku Series adapts famous classic Japanese literature and is less about horror, it falls into same category with psychological and thriller and overall creepiness. 

both are episodical horror tales 

They are both newer Junji Itou anime, that follow some of his classic stories.  

Both are fairly similar in horror genre. Half-mocking stories and oddities. Ito Junji has some stories in school, similar with Inuki Kanako, as the characters Bukita and Souichi are clones.  

Episodic series of horror shorts. QSYY is basically the Chinese version of this anime.