If we are talking back yard casual target practice then you get no strong arguments from me Mike, but if shooting in formal (or formal-ish matches) the FAS takes it. Its possible you may have not tried a correct sized match grip, which if you take the time and trouble to select for the correct fit, will get you much more out of the FAS in correct hold ability and repeatability. Indeed, in selecting a medium grip and spending 20 minutes adjusting for best fit, i can honestly say i have never shot a better fitting pistol, even including a FWB 65.
Sadly i could do none of this with the SIG and ending up just using it duel handed as if a HW75…Indeed, i actually find the HW75 a better gun and more powerful too…Its still a decent gun and better looking than the 75. I know of 2 people who prefer it the 75.
Accepting at this level, that its just a few edge effects which may favour one shooter over another.