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I am not an expert; but, the majority of issues with the 6DCT450 arise from a lack of maintenance. Ford offered gearbox servicing as a distinct service from the automobile maintenance, and owners were reluctant to incur the extra cost of over £300 for the gearbox service.

The 2.0L EcoBoost is disparaged mostly in the United States, where it is colloquially termed the "ecoboom." This mostly seems to result from the Focus ST engines failing and carbon accumulation around the valves. The plastic components in the cooling system may become fragile and fracture.

Provided both are properly maintained, they should demonstrate reliability. I have accumulated around 100,000 miles between two vehicles equipped with 2.0L EcoBoost engines without encountering any issues. I check all fluid levels regularly and replace the oil biannually.

I have communicated with many of our acquaintances in the United States. The issue with the Focus ST Ecoboost is that it has a manual gearbox, and many drivers use it inappropriately by selecting incorrect gears, so misusing the torque, since they are often accustomed to automatic gearbox vehicles.

If you get the Mk5 Petrol Ecoboost, it will use a conventional torque converter gearbox referred to the Ford as the "6F Mid Range," developed via a collaboration between General Motors and Ford some years before.
They manoeuvre well, particularly when use the paddles under the steering wheel rather than only depending on "kickdown" with the throttle pedal, so enhancing control.
Officially, there is no service schedule for the 6F Mid Range, and it is not generally considered a problematic gearbox, however certain individuals may criticise anything.
The diesel Mk 5 versions maintain the Getrag Powershift gearbox.