I don't think there's a lot in it to be honest between vendors. They are all cheap garbage with lurid ass chunks of metal and artwork designed by a 5 year old stuck all over them.
And there's one thing you can NEVER trust and that is objectivity from gamers when looking at failure and reliability statistics. It's one huge cargo cult.
Notably my kids both have Ryzen 5600G + MSI B550 boards with no problems.
I have been using Gigabyte for a very long time and had no problems. ASUS was OK for me too, but MSI boards were the worst due to stability, driver and cooling curve problems. Don’t buy MSI.
The B550 series is a power reduced cost cutting version of the x570 boards. They are only meant for the 6 core version of chips, and the 65W versions. You need to pick your components carefully.
VRM is the component that you need to be looking at regarding the power delivery for the CPU. There are many motherboards that combine a lower-tier chipset and a high-end VRM.
B550 was that limited initially. Even the Ryzen 9 5950X runs on B550 series motherboards today. B550 is a bit scaled down, e.g. no PCIe 4.x lines, just 3.x, but that's OK with me.
My motherboard is an ASUS ROG Strix variety with 4x32GB ECC RAM and the Ryzen 9 5950X works just fine.
But at that point I was using the Lenovo box. So I just sold all the crap on eBay for the next victim.