17 or 18 inches ??

Hello, unfortunately I did not find any suitable answers about the search, so I’m going to post my question to you now. Would like to tuck in new summer tires and am still unsure if I should do 17s or 18s on it. Apparently the TT with 18 inches should look like a TT country. Is there anything to it. Does not want my car to lie deeper. It should only look good. For the tyre brand/type and the feet I decided as well. It is now only noc h around the size and its optics. What do you think? Who has images to compare?? Greetings Petra