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Would it be more durable or efficient in any measurable way?
In theory at least they will be, yes, because angular bearings are better at taking non-axial loads . In practice I suspect the difference will be marginal if any, and angular bearings will need to have the preload set carefully. Setting the preload on Rotor 3D+ cranks isn't hard or difficult, but it will need to be done right or the angular contact bearings will eat themselves.
Brommers
hippy
Are they better/worse? I presume they're better because it's more expensive but that's not always a useful metric for being any 'good'.
Would it be more durable or efficient in any measurable way?