How does the Tam O Shanter compare to a Coticule?

I read that the Tams are about 6-8k, and the Coticule is around 8K. The Scotts are a slow cutter, and the Belgian is a medium cutter. The O'Shanter is good against microchipping too I hear.

Any one care to comment on the differences and which might be 'the one' if they could only have one. Also, for what reason.