Castrol synthetic or Valvoline?

I run 5w30 in all my vehicles if they don't leak or burn less than a qt at 3000 miles. Otherwise I bump it to 10w30. If I have a leak tho I'm usually prone to fix that problem. I don't ride a Harley so my ride shouldn't leak oil lol. If I'm burning off oil tho then I have to find out why and fix it.