I've never had good luck with Gigabyte. Their bios is pretty gross as well.
As far as quality goes though I've heard nothing but good things about the Z390 Gigabyte boards. Heard the Taichi from Asrock is pretty good.
I am looking to a Z390 motherboard to Pair with the 9900K
I seem people recommend the Z390 Master by Gigabyte but I concerned about the following
I just worry I won't be happy with this motherboard
I wouldn't worry to much about it, Gigabyte is solid, rather Gigabyte then MSI in my experience.
Asrock is pretty good option if you want a very decent alternative, they have pretty good models at competitive prices, like the Z390 Extreme.