This is a value flagship next to a halo product, and the price gap says it: the SC3 Ultimate is 35 Nm of professional-grade hardware on Simucube's newest IPM motor, topping our fidelity and build axes, but it costs three times the R25 Ultra. The Moza answers with 25 Nm, its own new-generation motor and a higher overall rubric score thanks to value - it is the base that made Moza a real refinement contender rather than just a cheap one.
So unless the requirement is truly professional, the R25 Ultra is the base to buy - it delivers flagship torque and most of the refinement for a third of the outlay. The SC3 Ultimate is the pick when you need 35 Nm, the newest architecture and the absolute top of build quality, and the budget is built around it. Both are excellent; they are simply aimed at very different buyers.