The last three rifles I’ve built all had late Ketlands, I’ve gone two Kibler and one Chambers.
Speed wise, I can’t tell a difference, and have had onlookers comment on how fast both locks are.
That being said, I have a slight preference for the Kibler, better finish, and I prefer the linked mainspring design.
In fact I have one on my bench now going in my current build shortly.
But it really comes down to Chevy or Ford, they’re both fine locks from highly respected manufacturers.
Bob