IMO Green bearings fail just based on issues related to them not being the OE-designed part; more care needs to be taken that they're the correct dimensions, installed correctly etc.
Tapered roller bearings in live rear axles are overkill, nobody else really used them besides Chrysler. I've personally never heard of them failing except in extreme abuse/neglect situations (water intrusion/lack of grease, way too little or way too much axle endplay).
If I was building up a rear end from scratch I'd seriously consider the Green bearings even for hard cornering. IIRC Ford rear ends use ball-type rear wheel bearings (or at least non-tapered rollers) and those aren't blowing up left and right when guys build up and race their older (Fox body, SN95 etc) Mustangs at road courses or autocrosses. Pressing on new tapered rollers on a ~3-foot long axle shaft sounds like a PITA.
