Vento TDi with DSG,what else to say - Best in Segment
Nothing is changing except the engine is diesel,in regard with gearbox no issues.ACtually VW is giving warranty for DSG setup also ,i think it won't fuss you,unless you treat it so badly.
One doubt Mr.Fiesta ,As you have other 2 cars why a diesel, it will further push the maintenance cost.
Volkswagen service interval is 1 year or 15000 km, for that i think with your other 2 rides,petrol is good.