My favorite AK seems to vary with how my mood is. A few years ago I would have said it was my Valmets, but in order to raise money for my overland van project, I sold all three of them off along with my AES10B. I really didn't think about it at the time, but the AK's that I never even thought about selling are my preban Chinese and my 1958 Polish Kbk-N.
Arsenal 104ur factory SBR. I have quite a few sbr's but that's my favorite, even among my krinks. Soft shooting, light, and compact. I am having a "104cr" built so I will have to wait and see if it can de-throne the 104ur.