Steve, You are good guy mang, but seriously, I knew you'd bite at that creature comfort comment.
But I reckon too that When you buy an ST, you get a great, and special looking interior (Even better with the Mk6.5 Update dash now), Unlike the 1995 Barina-esque Clio Interior (Which even Jeremy Clarkson ripped to shreds in one particular episode showing one of the earlier Clio's).
The Fiesta ST Interior EASILY equals, or I beleive from looking at pics even betters what I can see of the Clio. I know the Clio is Faster, likeley handles better, and Its a great car with a great rep, but its whole exterior/interior package to me leaves a bit to be desired. It always has.... for me anyways.
I know what one I'd take. But the Performance of the Clio I'd like!!