Go for Audi. 2 years warranty and good performance. if you think about second hand market, better to consider civic
what are the 2 models u r comparing and are these brand new?
There is no warranty for the Audi A3 as far as I know, Because it's not coming through the agent.
if you think about 2nd hand market value, low maintenance cost, spare parts (price & availability) go for the Civic 1L Turbo.