I have used Moog parts for years & never had a problem with them. They used to be one of the best & I think they are still pretty good compared to others. I hear good things about Pro Forged too, but not sure if they offer universal joints.
I use to bracket race a 1970 Corvette/454. Now those have 6 U joints so they were kind of important to get the strongest units. Every one I used that had a grease fitting would break at the fitting, only non grease fitting joints would not break. I think they might have been spicer. But for sure no grease fitting for max strength.