You should be aware that the question is ridiculous. If you want the best amp, go buy SP, Rudistor or RSA amp, they are around the most expensive. You ill be happy with, them. Why wouldn't you, you paid so much !
Now if you want what everyone has around here, and what is considered almost unanimously as the best DIY amp around here, go for a Beta 22. But, no offense to AMB, I'm not sure we should all go for the exact same amp, using the exact same parts (most of the time, glass jar kit).
Just build something you consider interesting (some pass labs stuff, tubes, hybrid, minimal gain, simplicity of the design or whatever you consider interesting). You will be happy with your build, it will sound damn good to you.
There are many awesome designers around here, you should take a look at their designs. Don't jump straight to the "I-need-to-have-this-amp-because-it-is-the-best. This is simply not how I think of DIY.
Simply my opinion, you are free to continue your quest for the "best" Diy amplifier.