My Mrs has a Tiguan, its a fantastic car and really well built, previous to this we have had Golf’s & Golf Plus and Polos, in comparison a Seat is cheap beside a Golf. To say it drives better than a VAG equivelent is odd as it is a VAG vehicle and it’s marketed as a cheaper alternative to a VW, a bit like SKODA which is also VAG,
A Golf will handle the mileage and they are bombproof, the DPF issues shouldn’t bother you as doing that kind of mileage the regeneration process will occur on the motorway at high temps as it should and not stuck in town in a traffic jam where it gets choked up doing a daily commute where it doesent burn hot enough.
Seats are ok if you are on a budget, at the end of the day that’s why they are marketed at the market segment, I’m not being snobby that’s just the way it is, I don’t dictate the market.
Or maybe try a new Polo they are a great looking car.