Both of these will work with the 9700K right out of the box. If you want to look at a Z370 you will have to make sure it has a newer bios on it to work with the 9xxx series CPUs
MSI Z390-A pro
Asus Prime Z390-P
The 100 and 200 series boards work with intel's 6 and 7 gen (6xxx, 7xxx) series chips. The 300 series boards work with intels 8 and 9 gen cpus ( 8xxx, 9xxx)
Both of these will work with the 9700K right out of the box. If you want to look at a Z370 you will have to make sure it has a newer bios on it to work with the 9xxx series CPUs
MSI Z390-A pro
Asus Prime Z390-P
The 100 and 200 series boards work with intel's 6 and 7 gen (6xxx, 7xxx) series chips. The 300 series boards work with intels 8 and 9 gen cpus ( 8xxx, 9xxx)