Just saw this, sorry for late reply.
I’d go with the tomahawk as it’s a solid board and usually recommended from what I’ve seen. Both are fine motherboards, but the tomahawk seems to be a little more “premium” compared to the b650-p WiFi. Also for a x3D CPU the tomahawk will offer a little more “power” and take better advantage of it.
Check out https://www.emudeck.com/ if you are looking for emulation which is what I assume you are looking for but if not you can disregard