Purchase advice for trainees! C-Class or Golf

I am still 2 years in training and urgently need a car. 500€ I have available. I will decide between a Mercedes C 200, built in 1997 with 136hp and 160,000km (2,900€) and a Golf IV 1.6, built in 1999 with 101hp and 115,000km(4,900€) I buy the car from a workshop and get 1 year warranty, both cars are well maintained and at first sight in good condition. I don’t know very well and wanted to know from you what is more useful? W he are high the costs for customer service, maintenance etc. ? How likely is it that it comes to repairs, and are these then really so extremely expensive in the C-Class than in the golf? For maintenance and repairs I have to pay myself. With insurance and tax I am supported by my parents, the 150 Euro more for the Mercedes, so would be feasible. I drive by car about 150km a week I would be very happy about your opinion! of course I like the C-Class better