When in the house for tech I used to use a buttboard, but it was too painful, so I sit with the LD.
During shows, I'm backstage at a console. I have tried a variety of "sit-ables" but when it comes to calling, I am always standing. It also helps the dancers know when they shouldn't bother me - when I'm sitting I'm relaxed between cues and can chat, if I'm standing - I'm in the zone, so do not disturb!
Yes, this does mean I get up and down a lot, which doesn't bother me - it keeps me moving. As an added bonus, it turns out that my movements also signal the crew to get ready before I start to call standbys.
And my winning choice of seat so far - a medium height (non-rolling) stool with a thick cushioned top that spins.