I have no literature to back this up, but I find that standard four-legged chairs (no wheels) are easier on my back, as they discourage my natural inclination to slouch. My undergraduate university had a computer lab with molded plywood chairs. They were only comfortable if you sat with good posture, and I found this actually made me a bit more productive, even if I couldn't wheel around the way I preferred.
My current home office chair is from my dining room set. It has a plush seat and a woven (wicker, sort of) back. It's comfy and gives some support, but it doesn't lend itself to leaning way back. I wouldn't go back to a wheeled task chair.
YMMV.