Palms facing (wrists vertical)...or hand(s) turned/rolled to whatever degree. Both hands? or one hand? Which hand?
Overlap? Reverse overlap? Claw? Double Overlap?
Should there be SOME things that should be thought of as benchmarks that EVERYONE should have?
Or should it be completely personal, as some people think putting should be.
I'd think it would be a balance between sound mechanics based on principle and personal choice based on...well whatever- feel, technique, style, results.
Many things to consider but I think it's a good thread to get going and inestigate.