Another vote for the ROUSH.
HP and performance differences between the comparable models (Stage 3 and SC281) is negligible. Both cars are great to run and look at but my preference would fall on the ROUSH side.
Some things to consider:
>ROUSH has a huge engineering background, their parts and packages are top-notch.
>The S/C unit on the Stage 3s dyno right at or above 360rwhp/rwtq.
>It's a proven fact that the ROUSH S/C unit produces the most power for 6lbs.
Either car will turn heads and evoke a permenant smile when you stomp the long skinny pedal.
Good luck in you choices though.