Which brake discs and pads for the thickness ?

Hello to the community, I need your help. I had the brake fluid changed today with my P and at the same time I took a look at the brake discs and covered correctly. I found that the coverings are unevenly worn. Especially the inside are already limit values of all 4 of the exteriors on the driver’s side, however, is only half gone.? I think that soon the wear indicator will report itself. Maybe one can tell me why those are so unevenly down and which brand of discs and coverings should I buy. One way forward he would like to see only for the parts without work wage 1100,00€. In the car accessories I called, which told me Zimmermann discs would be quite good complete material 665,00€ I have no idea at all which manufacturer I should take. I hope you have a few tips. Thank you in advance.