I normally set them up the conventional American way because - well - I'm an American. It's the way that I've always done it and nobody has ever given me a convincing reason to change. I've reversed the brakes for a few customers when they've asked so I don't really care.

One issue you may encounter, depending on the bike, is how the cable housings line up with the brake calipers. As a general rule on the bikes that I've worked on, the conventional American way lines up better.