Seat Leon ST FR 2.0 Purchase advice

I’m trying to decide between a 2018 Seat Leon ST and a 2016 Mercedes C-180. Driving profile: 10,000km per year, mostly short distances. Family with 2 toddlers. I want to know if there is a significant difference in driving comfort and interior noise (woman has migraine problem) between these 2. My current vehicle is a 2011 Hyundai i30, which is very noisy at highway speeds in the interior. I tend to be more new to Leon because of the larger trunk, the better extras and the stronger engine. These are the details: Seat Leon ST FR 2.0: Price 16000 2018, 110000 km, petrol, DSG ACC, Lane Keeping Assist, Apple – / Android Car Play TUV and service. All previous services at Seat. C-180 Avantgarde Price 15000 2016, 135000km, gasoline, automatic Tempomat (not ACC), Lane Departure warning (not Lane Keeping Assist) Service is due, all previous services at Mercedes * Have me also Skoda Octavia + Superb, could not find anything in my ACC with this criteria.