I think going blind into something amazing without having a clue is so satisfying that exploring the "right" watching order of a franchise is not worth the risk, even if it works out as supposed and you don't get spoiled beforehand (which is what happens most of the time...).

So if you are asking this peculiar question for the very reason I suspect brought you here today my dear friend, please be advised that you now possess a unique perspective into the nisioisin universe that is totally free of the prejudice and expectations that other people may have placed into your subconscious otherwise (sometimes with the best intentions, or perhaps without even realizing...). Great. Please share a review!!! what series was your first into the monogatari franchise? what are your opinions?

In my personal case nisioisin was born into the world a couple of years ago with Owarimonogatari and it was delicious. My opinions on Koyomi and Hitagi and Sodachi are therefore substantially different from many other fans of the franchise, as you can imagine! (eventually finding out that many people love Sodachi as much as I do was relieving as frack back in the day!!!)