While it's true that Home Assistant runs on a Raspberry Pi, once you start adding integrations, the SBC soon gets outmatched.
Geekom have an excellent reputation for the quality of their mini PC lineup, and the A7 Max is the new AMD flagship design.
If you're not willing to wait and need something now, we think a mini PC is going to be a good option. You can get them for an affordable price, and the mid-range models still pack a ton of power.