Grumpy Jenkins said in an interview a few years ago that he still keeps sets of original GM "Moraine 400 series" bearings in the back of his shop, for use when he has a "problem child" bearing in an engine, said they were the best he ever found. Won Pro Stock in 1973 or so using stock bearings in a 10,000 rpm 331.
You will find people all over who talk all kinds of mechanical nonsense just because they bought into the ad hype for something. Correct clearances and proper machine work mean a lot more.
I like King, Federal Mogul and ACL bearings myself, Clevite is overhyped IMO.