Both put out 25 Nm and both score near the top of our rubric, so this is not a mismatch - it is a real choice between a newer base and a proven one. The R25 Ultra brings Moza's latest motor architecture and the modern Moza ecosystem, and it was the base that showed Moza could compete on refinement rather than only price. The SC2 Pro is the six-year reference: the best software polish in the class, wireless wheel tech with no latency penalty, and reliability owners still praise years in.
Interestingly the cheaper base here is the older one, which shifts the value argument towards Simucube. The SC2 Pro undercuts the R25 Ultra and adds the software and reliability edge that come from years of maturity, while the Moza counters with a newer motor and a broader, more current ecosystem around it. On our scoring they trade blows - the Moza edges value and matches on build, the Simucube leads software and reliability.
So the pick is about temperament rather than a clear winner. If you want the newest hardware and the modern Moza ecosystem, the R25 Ultra is the one. If you want the proven, best-polished flagship at a lower price, the SC2 Pro remains a superb buy and the value choice of the pair. There is no wrong answer here - both are excellent 25 Nm bases.