I'm more or less stuck with KL for my CPH-AMS shuttle (in economy), as their schedule suits me best, but after April 1st I shall book longhaul flights (in business) based on schedule and price. Once I am more familiar with the in-flight and ground products offered by other airlines, this may become a factor as well.
As a LTPE I need not worry about requalifying, and the Privium ClubLounge not only beats the competion at AMS hands down, but is available regardless of airline flown too.
Johan