I am running a Pi 3. I would have thought it should be able to handle my small system without issue but have been looking at an upgrade anyway just incase.
The question is to what. I not looking to spend a fortune so was thinking a Pi 4 but I was also thinking would it best to move away from SD card based systems.
An ODROID-N2+ would be the obvious choice if you want a low power device that runs Home Assistant well. It’s an official hardware target for HA developers and therefore will be fully supported in the long term.