After building on both, the B550 and the X570 versions I must say I prefer the B550. Not only because of the VRM, improved memory OC, and lack of fan chipset fan (1 less thing that can break), but the board itself seems like a more refined version stuck on PCIE 3. The board feels nicer, looks more thought out, and refined. For example on the B550 you have the post code on the top right as opposed to the bottom, its easier to see, and on my O11 Dynamic its almost blocked by fans. The M2 slots have thermal pads on both sides, the X570 leaves the M2 floating and has thermal pad on the top only. Its just subtle differences that I noticed and cought my attention.