I have a mix of 'right-front' and 'left-front' on my bikes.

On the bikes which are close to, or completely original, I leave it as left-front (I'm in the USA). However, when I make changes to the bike, I will usually also change the brake setup to right-front.

I just find it easier to control and brake one-handed with my right hand (I'm right handed), so, since my left is used for signaling, I want my right hand on the more powerful brake.

I don't seem to have any problems adjusting to the different brake setups on my bikes.