Previously thought the Aeron was much better than the Embody, but the Herman Miller Embody that is collab’d with Logitech is actually a massive upgrade on the regular Embody and is now the elite winning chair. 

I am one footstool away from ultimate home office comfort. Which is a good footstool to buy

Wow, sounds like you've reached the final stage of home office evolution! 😄 Logitech x Embody is a truly top-notch combo, a true gaming throne of the future.

As for the footrest, to bring comfort to the "ultra" level, you can take a closer look at these options:

Herman Miller Eames Ottoman - if you want something in the style and level of your chair (but the price can be steep).

Humanscale Foot Rocker - minimalism, ergonomics and active movement even while sitting.

ErgoFoam Adjustable Foot Rest - soft, height-adjustable and super comfortable (often recommended in ergonomic setups).

VARIER Move or Balans Footrest - for those who like to sit in non-standard ways and change the position of their legs.

And just a life hack: if you want to check whether you need a fixed pouf or a swinging/moving one, you can first take something inexpensive, like an adjustable stand from AmazonBasics.