Ford Focus Mk1 RS or Mk2 ST, is it a silly question???

Focus RS mk1, 220bhp, 0-60 in 6.2 seconds

The Focus Mk1 RS and the Mk2 ST have very similar power and performance, if not price tags. So which one would you go for, an obvious choice really! Or is it?
I wrote up a little feature on the two cars looking at their value, as both a future classic purchase, and as a practical classic purchase. You can read my conclusions below