What do you think the best scale is for hex maps?

What do you think the best scale is for hex maps? According to Delta's D&D Hotspot, the original Outdoor Survival map can be inferred to have a scale of 1 hex=3 miles (see http://deltasdnd.blogspot.com/2012/02/damn-you-gygax-part-3.html for details). I've seen D&D and OSR hex maps commonly use a scale of either 5, 6, or 10 miles per hex.

I wrote this partially in an attempt to "Holmes-ify" the classes in LotFP. Not sure how well I succeeded.

I wrote this partially in an attempt to "Holmes-ify" the classes in LotFP. Not sure how well I succeeded.
Does this idea appeal to anyone else besides me? Additionally, do you think these house rules could actually meet the intended goals? Anyone want to talk class design?
http://dragonsgonnadrag.blogspot.com/2016/12/lotfp-and-classic-trio-possible-house.html