Everyone has their preference. I have heard 24 hour chairs are the most comfortable but have never tried one. They are typically used in environments where someone will be sitting in it 24/7/365 ( http://endura-gsa.com/ )
Here's a site that might save you some money if you're looking to buy a task chair. I think they might be refurbished but I'm not sure. The prices seem good.
https://www.madisonseating.com/
You can always try FB Marketplace or Craigslist for a used one and save a few $$$.
What's the verdict?
Good furniture is usually worth spending real money on.
Never used an Aeron so can't compare. But the standard version looks like it has rather poor lumbar support. So I'm guessing I'd find it uncomfortable.
I got bigger wheels to make them easier to roll on carpet.