The Herman Miller Mirra 2 Chair is a good office model, and it’s priced comparably to the Aeron. But we think the Aeron is a better chair, with a more comfortable seat and better tilt controls.

The Cosm chair, by Berlin-based designers at Studio 7.5 for Herman Miller, is the pinnacle of personalization. Among its features are auto-harmonic tilt, which lets the chair instantly adjust to ...