To select the best mining motherboard for yourself, you'll have to accurately gauge your mining needs and determine how much power you require.
You'll then want to assess how many GPUs it can support and the type of CPUs it supports. The more PCIe slots it has, the more graphics cards you can connect to maximize performance.
For better safety, check if the motherboard has stable power delivery features and systems to manage voltage fluctuations. Look out for the build quality, support for M.2 storage, and the amount of RAM you can expand it to. If you plan to use the motherboard for gaming, ensure that there's support for that.
Lastly, you'll want to calculate the motherboard's price and analyze how long it'll take for you to profit from it.