All this talk about favorite CRKs makes me a bit crazy because I would find it very difficult to make a definitive judgment.
My first, a Regular from 1998, has pride of place since it was bought by my wife for my b'day back then and I could never sell or trade it. It was my first "really good" production knife (beyond Benchmade and Spyderco).
As far as patterns, the two Zaans, DP and Tanto, and the 31 Insingo really trip my trigger on both aesthetics and function. Love 'em.
The small 21 Insingo is great because of both the blade and the "Glorious" scale which I love. The small is a little small for my taste, but is a niche knife for occasions where a larger knife would not fit the bill. So I would place it a (small) step behind...though it is a beautiful example.
Finally, I suppose that leaves the 31 Tanto at the back of the pack...and yet, I still like it quite a bit. It feels great in hand, is sharp as can be and opens with authority. What's not to like? (I think it will be the knife which will end up getting the most use over time, but that remains to be seen.)