For a while I preferred Herman Millers. But after spending a year with Steelcase chairs I discovered that Leap is the most comfortable and least fatigue inducing chair for me. I even liked that its seat holds its angle - unlike swivelling seats of HM chairs.
Fortunately, Madison Seating sells used Leaps for less than $300 in perfect condition so I got one for home too instead of a previous favourite from Herman Miller.