I use a Roc-n-Soc throne at home. When performing at restaurants and similar venues, where I need an elevated position, I use the K&M 14047B, which is an excellent adjustable stool. On both of these, I use the back support. I have significant back problems, so the quality and adjustability of the back support was critical. I also use an inexpensive Ikea "Franklin" stool as a backup; on that, I had to add cushions to the seat and back to allow me to play my long jobs (often 4+ hours). The K&M is my main seat -- I've been using this same one happily for over five years. It's built like a tank, very stable, quite comfortable. Note that due to my back issues I use a Dynarette cushion and a low footstool on the elevated thrones, a Dynarette and no footstool on the Roc-n-soc at home.
Thanks to the comments about the Adjustrite chair. I haven't noticed this product before and it looks useful. It doesn't have the range of heights that I need for public use, but it definitely has some nice advantages.