Depends on specific boards. Each manufacturer has good boards and worse ones.I want to ask if Asus' Z390 motherboards have a VRM array inferior to MSI or Gigabyte?
How do you feel the Z390 Aorus Pro, I personally don't like Asrock even though it's a good brandView: https://www.reddit.com/r/intel/comments/a0n058/asus_vrm_and_damage_control/
Asus messed up quite a bit on their Z390 lineup, many youtubers and tech media covering their boards found them to be somehow lacking and inferior compared to similiar priced models, the VRMs were weaker and hotter than most.
I found that the Z390 Extreme 4 is one of the best out there, top quality vrms and packed with features with a really good price. You can't really go wrong with it.
All of the z390 Aurous boards are good and ready to handle a 9900k.How do you feel the Z390 Aorus Pro, I personally don't like Asrock even though it's a good brand