I also wonder how much your local terrain comes into play. If you are grinding up a fireroad for 1 hour, then turn around and bomb down an enduro run, the flat lever position like Yoann's might work really well. Grinding up, you're seated high in the saddle and your fingers don't need to hover over the brakes. Point down, drop the seat, your body is now low and in line with the horizontal levers.
Here, its pedal, rock, brake x infinity.