What engine for Yaris?

Hello, my friend wants to buy a Yaris (new car). Which engine would you recommend, 1.0 or 1.3? She drives mostly city traffic or highway (directive speed) and is not particularly sporty ambitious. That’s why I thought the small 1.0 engine would be enough and is also the most economical. Or is it undermotorized? Does it matter negatively that he has only 3 cylinders? (quiet running etc.). Unfortunately I didn’t have time to come with the test drive, and m a friend is indiscriminate (“Can you judge hard on such a short distance”. Maybe someone already has the new Yaris with 1.0 or 1.3 machine here and can report on his everyday experiences and the everyday average consumption. Thanks already in advance…..