It's my opinion that brake fluid is brake fluid. The manufacturer has to meet the requisite DOT specifications and the premium brands just tend to have higher boiling points, but that's not normally an issue on street bikes. On a track bike it might be an issue. If you have been using Motoul and are happy with it, I think its unlikely you'd notice the difference with a "better' brand.
We used a hydraulic fluid with a much higher boiling point on the jets I used to work on in the Air Force, but that's a much harsher environment than our road bikes live in.
I currently use Brakebest from O'Reilly auto parts, but have used other brands and have never had an issue with brakes due to the fluid I used as long as I didn't wait too long to flush and refill the system. I've bought a few bikes with frozen brakes from neglect, but that's not the fluid's fault.
I flush and change the fluid every two years regardless of what the manual says. I can't see changing the fluid every 12K like the Gold Wing schedule advises.