Best big cams available
Wild Country #6 is the best large cam around. This is because it is the widest, that is, the distance between the two outer cam lobes is greater than any other cam with equivalent range. This gives it superior stability and makes tipped out placements a little less scary. Furthermore, this is the lightest #6 sized cam. No reason to get any other cam in this size.
The #5 is also better than the BD #5 but the difference between the two is not as significant as the difference between the 6's.