I do wish there were more comparative literature on this subject, as it's difficult to find good objective ways to compare chairs.
Here are the Wirecutter's recommendations: https://thewirecutter.com/reviews/best-office-chair/
I wish there were someplace where I could go and actually try high-end office chairs. Chair preference is going to vary from person to person (which makes written reviews and comparisons kind of useless), but office supply stores like Staples or Office Depot only stock the low end (which may work for some, but don't have the adjustability or durability of higher-end chairs). I'd like someplace I can go to actually try out and compare a few models of, say, Steelcase, Herman Miller, and Humanscale chairs before I commit to spending the $800+ on one.
If you want to try and buy a Steelcase here you have to make an appointment with a sales rep outside the city. I get that basically they don't want to deal with general population but it's kind of infuriating.
Herman Miller dealers are everywhere, but I hate their chairs. The closest Steelcase dealer is an hour away, but it is worth the trip.
Protip: ask for the right wheels; one is designed for carpets, one for wood floors
This doesn't make as much sense as you might think. It takes several days for the benefits or drawbacks of a chair to become apparent.
I can second the Steelcase Leap recommendations; Leaps (actually, Leap 2s) more or less fixed the problems I was experiencing with my back. But, again, that only became apparent after many days of use. (I didn't choose the chair; I was contracting at VMware.)
As a contrast to the "find a local store" comments, I'll note that madisonseating.com sells used office chairs.