^wish i could answer your question. i know i have looked at a couple pairs in my days.
G, if you read this, and anybody else reading this;
Back when female was 'new' the common statement was that a 10mm female axle was 'about' as strong as a 14mm hollow axle.
Note that right now i usually the rear female inner axle is 15mm.
Sadly my female Kink hub wasn't worth shit, even though a second hand Primo Mix lasted me for years, and my Vandero also never had any problems in 3 to 4 years.
Now i'm resorting to get an Antigram- mainly because of the 17mm inner/14mm female bolts option.
Even though i don't know if it was me, or that the Kink hub was just a shitty batch, i wonder if people DO actually consider the 14mm-17mm inner axle STRONGER than 14mm male axles.