Most consumers immediately assume that the Focus ST would be the faster car as it is more expensive and it has more horsepower. In reality the Focus ST suffers from absurd understeer, longer braking distance, and almost identical 0-100 mph times. While perhaps a better daily driver if you need the space the Focus ST is by no means faster or even equal to a Fiesta ST around a short windy track or for fun in general.
In my personal opinion I would purchase a GTI over a Focus ST any day of the week. The GTI has roughly the same specs with significantly more impressive handling and 0-60 time that the focus ST cannot compete with. There’s a reason these cars sell for multiple thousand below MSRP
Infographic made using easel.ly