If it would has M.2 slot for HardDrive and 16x PCI-e slot for GPU with at least 2-slots cooling system it would be the best of the best
. But as yet Asus engineers have a work to do something better
M.2 SATA might make some sense - if there was any space on the board to PUT it.
M.2 NVMe would eat 4 PCI-E lanes you really prefer to use for GPU slots, and is severe overkill for a mining rig.
I DO wish they had arranged the board so that the 16-bit slot doesn't BLOCK 3 of the 1x slots if you put a standard dual-width GPU IN the slot though.
On the other hand, it kinda makes PS management a bit easier to not have 7 GPUs AND the MB/RAM/CPU on one PS and only 6 on each of the others....
ASUS B250 Mining Expert is the motherboard model.
https://www.asus.com/us/Motherboards/B250-MINING-EXPERT/ Mine cost me about $150 from Newegg last week.