Buy A2 or not: 1.4 or 1.6 FSI what should I buy??

Hello I’m looking for an A2 for my sister now we don’t know which is the better of the 1.4 or 1.6 FSI, has one maybe brochures with the data from the moths (usage unsw…) She usually drives in the city therefore I say 1.4 is enough, my father again 1.6FSI and how is the Audi A2 so?? Vulnerable? Often in the workshop? Insurance? Parts cost? ́ Dangerous?