Neither are known for reliability. I test drove a Zafira and bought a Touran as we had owned three excellent VAG cars before. Owned it 2 years and still can’t believe a VW can suffer from so many gremlins. So far it has had problems with the Dual Mass flywheel shuddering, electric window sensors opening the windows, cruise control kaput, wipers not parking, webasto heater smoking like a wet garden rubbish fire, creaky dash trim, clonky tailgate, loose window glass (winder mechanism goes down, window plummets a few seconds later). Yet to experience other known faults with the suspension / uneven tyre wear and the ABS unit failing. I’m kind of hoping the DMF will fail spectacularly and cause the hateful thing to catch fire, as has happened to others. The main dealers are unbelievably arrogant in their dismissal of well documented faults.
This is all a real pity as the ergonomics, practicality and running costs are second to none.