Xenon retrofit Original or accessories??

Hello! I've been the owner of a 4.2 V8 for a few days! I'm thinking about installing these xenon accessories. The other alternative would be a relay set and beautiful bright incandescent lamps! What do you think is Sinvolll? I know the burners are illegal but colleagues in other cars have had a lot of experience with the light output! Is there also a possibility of a Xenon conversion with original parts of the Audi A8 oa.?

Thank you for your answers!