veneers - composite or porcelain? price difference is insane

want veneers on front 6 teeth. got 2 very different opinions dentist 1: composite veneers 1200 per tooth. done in 1 visit. can be repaired. lasts 5-7 yrs tho dentist 2: porcelain veneers 3500 per tooth. need 2 visits. looks more natural. lasts 15-20 yrs. BUT they shave ur actual teeth which is scary thats 7200 vs 21000 for 6 teeth. massive difference is porcelain really THAT much better?? also someone told me about "no prep veneers" or lumineers where they dont shave anything. anyone done those here? my teeth r just slightly uneven and theres a small gap between front two. nothing major