Bart, I am fairly convinced that OEM (junkyard) CVs are stronger than aftermarket, and certainly stronger than rebuilts. Plus, I know they will fit in the cup so I can just swap the outer CV, which usually is what breaks.
I have only broken 2 CVs in almost 3 years. One was a full throttle charge up a hill in deep snow, found myself suddenly airborne and when I landed (foot still firmly on the skinny pedal) one of the inner joints exploded. The other was climbing a staircase on Golden Spike, the ledge was a little undercut and I had all the stress on one wheel.
With a little common sense avoidance of suddenly dropping rapidly spinning tires onto traction (a locker actually helps avoid this), and picking a better line that shared the climbing burden between the wheels, both breaks could have been avoided.
But even if you do break a CV, at least around here I can get junkyard CVs for $40 off the vehicle, and to change an outer only takes an hour, so not a big deal anyway.
Marlin, you should have come with us on Moab Rim and Cliffhanger if you wanted more challenge in Moab...
95 Trooper with a buncha stuff nobody here cares about...