There's no single answer to whether a Saleen Mustang or a Roush Mustang is faster. Both companies offer various models with different performance modifications across different Mustang generations. A top-tier Saleen Mustang could easily outperform a base-model Roush Mustang, and vice-versa.
To determine which is faster, you'd need to specify the *exact* models being compared (e.g., "2023 Saleen S302 vs. 2023 Roush RS350"). Then, you could look at independent performance tests or compare their specifications (horsepower, torque, weight, etc.).
