Best Panel OS Options (Pi4 / x86 Win10)

I’m new around here and I’m getting the hang of the Home Assistant backend and automations. I have had some success with some amazon Fire 7" tablets using Fully Kiosk browser and I can move forward on those in some rooms.

My main wall panel in the living room is an x64 Toshiba 10" tablet currently running Windows 10 and HomeSeer HSTouch. (I’m moving away from HomeSeer to Home Assistant)

I also have an outside 32" tv that I want to use as a Home Assistant outdoor display for things like time and temperature. RPi4.

I’m looking for options for both the x86 10" tablet and the Raspberry Pi 4. From my experience with the Fully Kiosk browser on the Fire tablets I think I need something that will boot directly to a full screen browser and load up Home Assistant full screen. I believe I can work on the screens in Home Assistant but I’m not sure what the best option is for software.

For the x86 10" tablet keep Windows 10 on it and figure out how to automatically launch a full screen browser? Slick it to Ubuntu? I’m really not sure. Windows 10 brings some os maintenance that I would like to get away from but if I need to stick with it that is fine. I’d prefer some kind of hands off appliance os.

For the Raspberry Pi 4 I’d like to be able to turn it on and after the boot process have the hdmi output showing Home Assistant on my tv. I’m not sure how to accomplish this. Is there an sd card image that had all this built in terms of launching a full screen browser on boot?

Since the tv will have no keyboard / mouse or touch screen I wll also need to figure out how to rotate the screens around from time to temperature etc.

Thank you for any advice.

Did you found a solution for the x86 system? What do you use as browser and as operation system?