You pose a loaded question because in my opinion stopping should not be a priority. If anything you want something to slow down your momentum enough to navigate a treacherous course or obstacle. If you're brakes are strong enough to stop you then you're more than likely run the risk of losing your wheels from underneath you.
Furthermore, consider the courses you race and the typical or anticipated conditions. Wheel choice will also weigh heavily on your brake choice(s).
Sometimes what the pros ride on their bike can be a bit deceiving because of sponsorship deals. However, study the unsurpassed quality and attention to detail that goes into a pair of Paul's Neo Retros or even the new highly adjustable TRPs (Tektro's high-end lable.) They're adjustable to the point you can tune them for specific race conditions in advance.
Hopefully this will help influence your decisions.
It's easy to get rid of that stupid yoke and just put in a straddle wire with a hanger - you've got plenty of cable so you don't have to route a new one. While I run Paul's on my race bike, I've put Avids on the pit bike and training bike and they work fine. Stop just as well and they're practically bomb proof. I probably run the Paul's 'cause they're just-so-pro, you know ... Just get rid of that crappy yoke thingie the Avids come with ... it's take two minutes and costs about $5. Don't know if there's a difference between models. Just a tiny bit of weight, is my guess.