I test drove both. ST felt faster / slightly more responsive but I found the CTR more fun to drive and the ride was more comfortable.
Ride more comfortable on the CTR? you having a laugh?
Are you spending your own money, if so buy a Golf GTI, the ST is a wonderfull car and is cheap, but it goes through tyres quickly (12-15k), and mpg is not great, i get around 30mpg with mainly motorway driving.
Ive had a ST3 for 18 months and 45k miles, and its truly been great, but its not as nimble as the Golf or the CTR, the big engine upfront comprimises the handling a touch, but that simply sublime engine and exhaust note more than makes up for it.
But mine's a company car, i certainly couldnt afford to run it myself, and i dont earn a pittance
You cant go wrong with any of them imo, GTi,ST,CTR all great HotHatches in their own right, they are all comprimised to a degree, but that makes them better for average joe, older Civics for example were just too harsh to do any serious miles in, people like me just had a choice of mundane mondeo's!
The reno Megane also gets rave reviews.