Test driving the Gti PP tomorrow if its raining will probably not do its best feature justice unfortunately.
If it is dry at all, don't bother to stick it in sport, it will make an awful fake sound and fk up the steering with a heavy feel to give an impression of sportiness, but seems to remove feel. Better to select the individual setting via the "mode" button and just put the diff in sport, then find a B road. It wont compete with the others on you list at all, but it may offer something different.
It does need to be dry I think