Both good brands and make some good chairs.

IMHO go to a store for each and try some and see what feels good. You don’t have to buy there, but figure out what you like (and don’t). It’s definitely a personal thing, not just height/weight.

A lot of those stores sell Frankenstein chairs. They cobble together parts from various broken chairs and sell them for way too much. Do a search on Reddit for Madison Seating (think their in Brooklyn) for some stories. Those stores also tend to not be that cheap for used/“refurbished”chairs. If you’re spending that kind of money, I’d just save a little more and buy new.

Your best bet is keep an eye on Craigslist etc for chairs. If you have a car expand to the metro area and you’ll find some deals pop up. If you’re stuck within transit boundaries, expect a premium price. I found a Herman Miller a few years ago in nearly new condition for around $200. Was a little drive to get it, but totally worth it, at the time crappier condition chairs we’re selling for well over $300 locally.