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Quick google suggests Angular contact bearings are designed for applications which need to support both axial and radial forces like headsets which turn and also are subjected to force up the steerer when hitting bumps etc. Cranks will naturally have some radial force side to side but I would think its minimal in relation to the axial forces.
But I don't have a fucking clue what I'm talking about
PhilDAS
"Enduro Angular Contact bearings are specifically designed for hubs and bottom brackets. In standard radial bearings, only 3 or 4 balls make contact during the load, at any given time. In Angular Contact bearings, ALL balls are engaged and spread the force over a larger surface area, to decrease friction, and minimize wear."
It's not shit on paper. But the current BB is clicking so maybe it is.