Despite (or perhaps due to) being a completely different vibe and style from the rest of the Monogatari series, this is hands down my favorite.
Owarimonogatari (1st Season)
Solid Monogatari with added mystery and great character-digging dialogue.
Tsukimonogatari
Not bad for progress of overarching plot, but awkward ecchincest is back.
Hanamonogatari
Very good arc here, all the good supernatural, psychological intrigue, with hardly any of the annoying ecchi aspect. Praise.
Monogatari Series: Second Season
It's worth slogging through Nisemonogatari and Nekomonogatari to get here. Fantastic arcs.
The Garden of Words
Short, sweet, and ridiculously beautiful in animation.
Hinamatsuri
A quality comedy that does a surprisingly good exploration of the struggles of “making it” in life.
Nekomonogatari Black (Kuro)
Was the Tsubasa Cat arc in Bakemonogatari not sexy enough for you? Here it is again but in lingerie. And I GUESS some more character development with Shinobu.
Nisemonogatari
Too much inexcusable uncomfortable fan-service (read borderline illegal) to make the neat dialogue worth it. It is important to the overarching Monogatari story, so if you're embarking on it, muscle through.
Bakemonogatari
A delightfully artsy and philosophical adventure, truly unique.