Take the Audi ONLY if you are prepared for regular bills that are more than the Rover is worth and potentially ones that will make your eyes water.
Do a bit of homework and see what stuff dies and/or needs replacing and at what cost. When I had the Passat I used this forum:
https://www.vwaudiforum.co.uk/forum/forum.php
I'd keep the Rover - but I'm biased
