Not much between them. More SATA ports and an extra M2 NVME slot on the Gigabyte. Only 1 M2 slot but USB 3.0 Type-a/c ports on the ASUS.
Personally I'd choose the Gigabyte for the extra M2 and SATA slot, but it doesnt have USB type a/c so depends which you'd prefer. They are v similar tho.