yeah, build quality is partly where the added expense goes. worth comparing them to see how impressive the type-R is. and certainly a stronger basket leads to less resonance and a tiny bit better performance.
the type-R also has greater power handling (300 vs 200WRMS), with potential to go louder. box requirements differ, with the type-S limited to sealed for optimum SQ (eg: 1.8~2.5cuft; smaller if need be). the type-R suits either sealed or ported, but ported will definitely provide superior subbass (eg: 2.5cuft tuned to 28; could be smaller too).
so if you have the power and the budget, and happy to build a ported box, then the type-R looks to be ideal.
good luck

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