I was always an Aeron fan because it is a great chair but also it was also a status symbol. Back in 2011 I was working at a startup that finally started making real money and one day a semi truck showed up in the back lot and everyone rolled their motley collection of random office shit chairs out and we unloaded the Aerons off of the truck, still wrapped in plastic. I still have that same chair in the office, 10 years later, and it is basically as good as new.
But...the high back Secretlab Titan chair is so much better. The back and lumbar support is great. The armrests are ok, but for less than $20 you can buy generic memory foam covers that feel like velvet clouds and position your wrists just right to help with avoiding RSD. The neck pillow isn't used all the time, but when I need to literally lean back, it is there. The chair also lays almost flat if you need a nap.
For less than $500 it is a no-brainer. There is an active subreddit (r/secretlab) that is almost cult-like, which was kind of a red flag for me, but it actually seems to be legit superfans and not marketing. The chairs have a five year warranty - up from three but only if you post about it on social media, which is also kind of a red flag. But it is a quality chair and after almost two years of constant use, the arm rests are completely solid and it still feels brand new.
There's nothing wrong with the Aeron but on the rare occasions that I'm in the office these days, it just feels...inferior.
Edit: The arm rests are actually great - I just meant the padding. They obviously go up and down, but they also rotate in and out. So unlike most chairs, you can position them so they actually support your complete arms as you're typing - not parallel to the chair, but angled in so your elbows are at shoulder width but your forearms are supported closer to the keyboard.
I forget about a lot of these adjustments because once you dial them in, it just feels right.