alasta:
The RS is a great track car but not that suitable for the road as the racing seats lack thorax airbags, and hence the vehicle does not comply with 5 star ANCAP.
The ST is a lot cheaper, and still has ample power and torque for highway driving.
Fair points. I actually wouldn't pick either, as a buyer, it was only an example from an alternative if you were stuck with Ford that did the two key areas - for me - better.