X2 even though despite issues that I've had with mine! There is always ways around the M-tronics if you don't like it. Just to mention Redfin builds a wicked M-tronics deleted 661 saw!
I really want a 661, but just because I'm a Stihl guy so I'm biased. It would be interesting to run both and formulate a less biased opinion,
I do not care for the av on the 395 nor the dolmars. There is no denying the capability of a 395. The 661 is no slouch either. If you are milling, 395. Cutting timber or just firewood, for me its a 661.