Chris King have gone centelock only on their hubs now. Not sure on their reasoning. Perhaps so they can sell over priced matching adaptors.CL is really nice from an ease of use perspective and a nice clean interface etc. I'm not an engineer but I'd also guess there's mechanical benefit in the spline interface over six bolts holding two flat surfaces together.
But, it's not sufficiently better to go hunting for. If you end up with DT wheels with CL hubs then just run the adapters until it's time to replace your brake rotors, then go to CL.