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@gbj_tester
Is it still 1993? I thought we'd all gone past cranks CNC'd from billet (from drawings I could do in O Level Tech. Drawing) nearly 2 decades ago. The ring is inside the spider because they couldn't, or couldn't be arsed to, make a dished spider. It has no effect on Q-factor, which is constrained by the need to fit a wide enough crank outside the chain line. Square taper might snap on tank drive sprockets, but the axles very rarely break on track cranks, albeit that they are pathetically floppy in torsion compared with external BB systems.
My money is on the £80 SRAM S300 being objectively superior, as the Taiwanese forgemasters who made it have access to superior CAD/FEA skills and superior manufacturing techniques.
