FTDNA is home to the largest Y-DNA database in the world, and certainly the largest Y-DNA database of Campbells. Combine this with their mitochondrial and autosomal databases and its the logical choice!
Also new is the ability to link your kits to a family tree hosted at MyHeritage to take advantage of all their DNA tools and matching features. And that is in addition to the tools and matching FTDNA provides.
Highly recommended by the campbelldnaproject.org team!