Welcome to the best Monogatari Series watch order guide!
The Monogatari Series is notorious for the discussions about the right watch order, heated discussions similar to those when people argue about the infamous Endless Eight, create a lot of confusion for newbies.
This guide was originally created by the Reddit user drubetzkoy, updated by maxdefolsch in 2017, and has been updated in July 2022 by me to include the missing two seasons.
I hope this guide helps you navigate through the slightly complex and amazing world of the Monogatari Series.

Here is the updated guide:

Now, when it comes to my personal opinion, I strongly believe that (especially for first-time viewers), the chronological order with "Kizu between Owari and Koyomi" is the best choice.
It flows smoothly and is the most fun in terms of suspense.

Credits to the original creator for their work and dedication in putting this guide together.