The ST is the old school recipe, like the 172/182 which is great fun but for me the Fiesta is... A Ford for a start, just find it hard to like them, boring looking and nothing special to me... I could list the many reasons why I chose the Clio over anything else but I'll keep it short... Diepe, a dedicated factory for all RS models as opposed to the general production line for all Fiesta spec's, so far the rarity of the Clio and above all else the sheer spec that you get for your money! Yes it's a few thousand more than the Fiesta but a same spec 1-series or A-class would cost 11/12k more, taking them over £30k... Yes they may be BMW and Mercedes but they are by no means 11/12k better in any way... I'm not being biased either as I looked at and specced up both cars.
Models looked at were BMW 125i Msport and Mercedes A250 AMGsport. I mention these models as any lesser engine would be nowhere near the Clio for power, size wise, they're not much bigger than the Clio, so I really do find it hard to justify (apart from brand snobs) and extra £10k plus... Sorry we were talking about the Fiesta... If I was in the market for a modern day 172/182, then maybe I'd be sold on the Fiesta but my loyalty lies with Renaultsport for many, many reasons!
p.s couldn't keep it short... My apologies!