Just came across this (via email from Sweetwater) on Fingerboard Radius for guitars. Apparently many/most/all guitars have a radiused fingerboard and this offers some insight as to advantages of different radii when choosing:
Fingerboard Radius: Does It Matter? - inSync
Curious about the curve on your guitar’s fingerboard? Join Sweetwater as we explore one of the guitar’s most misunderstood specs: fingerboard radius!
www.sweetwater.com