Mk7 GTI VS AUDI A3

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Hi all,

I'm considering getting back in the VW. I had a 2010 golf tsi which had cam chain issues that resulted in engine failure.
Now I am confused between A3 & MK7 GTI. Any recommendations in terms of WhIch year or how many  ks should i  aim for as my budget is$20k?

Is trade me is the best platform to buy??
Also, any common issues that I should be looking out for?

Thanks in advance.