Mercedes Viano 2.2 or VW T5 Transporter/Kombi

Hello, we (5-member family) are looking for a vehicle in the size T5/Viano. Have already compared different offers, but can not decide or probably have too little idea. We would like to invest up to 25,000 and would like to have a car, which in the best case ran a maximum of 70,000 km, from year of construction 2009. We have now found a VW T5 transporter (9 seats, 140 hp, EZ 2015, KM: 30000) and a Viano 2.2 CDI automatic (EZ 2009, KM: 40000, seats 6, car my husband likes the more car-like Mercedes model a little better. Test we will drive them both in the next few days. There are different models in this price range. I only wonder if it makes sense to spend so much money on a car from 2009 (built it is perhaps even more 2008) if you spend almost the same amount of money on a car. has experience with the models and can help us in any way? The car should be reliable, because we want to drive it for 10 years if possible. Thank you!