i have an f plate series 2 and a 54 plate st170 and to say which one was the best would be unfair, totally different cars altogether. could only compare the NEW st to it as both run turbo's. they just dont have the same driving, take the rs, you pull away then 2000-3000rpm... whooosh, turbo kicks in, st170-> power all the way but less torque. doesnt feel as fast due to it no running a turbo to push air into the engine and pull the fumes from the engine.

all in all, both cars are great fords not to be compared!