Which is thought of as a better or more pure form of breeding...
A. Line Breeding for Line's sake.
But the catch is...you know the breed is 'mixed' and has a lot of different bloods mixed in. For example...GA Plucker (thai, shamo, brazil and asil all probably mixed in).
B. Breeding for Breed's sake.
Just breeding Thai with another Thai that you like or see fit. As long as you know you are still keeping the breed pure for breed's sake. For example...a LHK Thai with another LHK Thai.
I would think that breeding for breed's sake is a lot more 'pure' than line breeding a line that has a bunch of crosses mixed in...correct...?