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The difference between a 9.5" and a 12" radius is about 1/32" at the edge. Often, there's as much variation in the "rounding" of the edge - ie. the radius is not constant parallel to the frets. A heavily beveled 12 can feel "rounder" than a sharp-edged 9.5. Between 7.5 and 16 - now there's a difference. YMMV.
For me, it's whatever I'm used to.
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