It depends I think.
A DSG equipped car in my view is an excellent choice if you're buying new or nearly new with a good warranty and don't intend to take it to high miles under your ownership or own for very long with no support.
It's a much higher risk and poorer choice if you're buying at 5 years old and 70k with a 3 month paper warranty and intend to keep it 4 years.
The problem in this case is that it sounds to me like the questioner's wife is likely to be doing lots of short trips - the school run maybe or as a shopping car, which means lots of low speed gear changes in heavy traffic, which is certainly conducive to dual clutch gearboces, especially those with (IMHO) a history of below-par reliability such as those from VAG, even the 'wet' clutch type.
Far better for them to choose either one with a much better reliability record on that score (like Hyundai or KIA), or, better still, makes than use traditional TC auto boxes or reliable CVTs, such as Toyota.
Note that a warranty will not cover a dual clutch box if it wears through normal usage just more rapidly - most, apart from (I think) Hyundai or KIA only come with 6 month warranties when new, and even then documented abuse will likely be taken into account when trying to settle any claim.
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