It's been my observation that the more experienced cyclists in North America use a right-front setup. It makes more sense if you're right-handed, because you want your more dominant hand on the more sensitive brake.

In a hard stop, you will usually slam on both brakes. If you want to reduce your braking distance, then as you feel the rear wheel start to skid, you MAINTAIN PRESSURE on the REAR, but ease off a bit on the FRONT lever. This weights the rear wheel enough to stop the skidding. When you feel the bike has stopped skidding, you reapply front braking, and repeat this process. Kind of like manual ABS braking. I'm sure they'll come up with ABS for bikes that works this way, once everyone's on e-shifting! Bit this is why you want the "smarter" hand on the front lever.

Obviously, if you're left-handed, bonus. North American bikes are set up for lefties!

I started using right-front back in the 70's when I raced cyclo-cross. It lets you stand astride your bike (on the left) on a descent prior to an obstacle (they're always at the bottoms of descents!), your right hand on the downtube in preparation for lifting it, and your left hand on the rear brake lever as you roll down the muddy descent.

So, if you a right-hander, it certainly makes sense to use right-front (moto) braking.

Luis