I prefer double muff. I've had the same Plantronics H101 headset since 1998. The stretchy cord has been replaced once due to the plastic covering splitting and the cable below the in-line press-to-talk failed through years of flexing. Other than that it's done the job nicely.
Mine has the bass/treble tone settings & they actually work, but there is no in-line volume control.
As mentioned by Plaz we have a choice of the binaural/monaural H101, the H31 or H81.