But the Borgeson box is already 14:1? , meaning adding a fast ratio arm and we are in the under 12:1? range, and at some point getting almost to fast for anything over mph? Besides that, interesting point on price/availability.
Strength wise, I can't see enough difference in real world use to matter, IMO.
I find the Borg box to be quite slow and will be trying the fast arms when I tear into the front end for some reason..
I have a 1.5:1 steering quickener that goes between the steering wheel and the box, but the fab work to put it in is not something I want to deal with on a completed car. Swapping arms is much quicker.