In theory esc is braking wheels to keep it tucked in and level, it's controlled by vdm now on the mk8.
While you've not got the full torque vectoring of the R, it's still probably achieving similar just on the front axle.
I don't think it's going to make it more powerful but might make it move around more, i felt that when I tried it.
So if esc sport gives you a bit more... Would off make it even more so...
The only word of warning is that esc does actually help you not die. I've hit standing water on the motorway at seventy and it's only esc that means I'm hear to type to you...