The Zojirushi makes respectable rice with minimal effort, as in we're about to walk the dog but we need to set up rice for dinner.
The Musui Kamado is a dramatic upgrade over an Instant Pot for every use except pressure cooking, for which we prefer a stovetop Fissler pressure cooker. Carefully following directions, it makes better rice than the Zojirushi. We use it whenever we want a feedback loop for fixed temperature, not unattended flame, such as cooking beans or stews. For tacos, I have to remember to transfer the cooked nixtamal corn for fresh masa, in time for my wife to start beans.
The Kamado-san double-lid donabe rice cooker takes the most care, and makes in my opinion the best rice, with a controllable bit of scorch as desired.
At home, out of expediency we use the Zojirushi to make our rice. I find myself avoiding meals that involve rice, out of boredom. In my work apartment, I haven't touched the Zojirushi or Musui Kamado for rice since adopting the Kamado-san donabe, and I look forward to rice.
If all sushi bar rice tastes the same to you, stick to the Zojirushi. If only food at the limits of your abilities captivates you, get a Kamado-san donabe. The Musui Kamado is the most versatile compromise. There's no novel physics here; its edge over both a Zojirushi and an Instant Pot can be explained by its precision-machined cast iron pot, of a better quality than Le Creuset or Staub (I have all three).
https://www.vermicular.us/shop/musui-kamado
https://toirokitchen.com/collections/unique-style-iga-yaki-d...