Currently between the 19's Michelin PS4S' on the mk7, 18s with Goodyear Asymmetric 5's on the mk5 and Goodyear Ultragrips 18s for winter.
I like the Goodyear AS5's on the mk5, I'd regard them as the perfect tyre for all year round for a GTI, great driving road feel, quite quiet, comfortable. I don't push them in the wet but they're very good then as well.
In comparison with the 19's Michelin PS4S', not that much in it tbh they're very similar, they're wearing quite well about 10-15k miles on them and they're at around 7mm.
Note I also got my Goodyear AS5's for £320 fitted versus at the time I was quoted £440 for the 18inch PS4's.