#1
so what do you think is the best guitar neck shape,fretboard radius and scale lenght for playing all kind of chords?
#2
Far too subjective for a meaningful discussion. Although most players who primarily do chording like a more rounded fingerboard radius.
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#3
I've found the flatter fretboard to be much better for everything since I've started to use the classical posture.

As far as scale length goes, I believe that if playing chords on 25.5" is harder than on 24.75", then you need to work more on correcting your posture and technique.
#4
Guitar comfort is not in any way objectifiable. Not sure why that's so hard to understand.
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