Of course I bought the Aeron because the internet told me to. In less than 8 hours I was really hurting and had to return it. Today, I use something from neutralposture.com. However, what is "best" for you depends on your body type. The most correct answer is "change your chair, sit and stand, move around" throughout the day, weeks, and years of your life. The desk is super important too. I use a very flat desk. I wished it could raise and lower on demand.
Today, I need to change my chair because I've had it for so long. I think you'll only find the perfect chair if you make it yourself. I really wanted a combo of the Aeron and the Neutral Posture 8500 for my body type and work habits.
I wish I had, but did not, explore all of these options. I wished I had tried the Humanscale. Please do and tell me how it works out for you. Options: Herman Miller, Nuertral Posture, Steelcase, Humanscale.