I used sylvania and ceratek, both with outstanding results.
I have 3 bmws, so on one I purchased new TYC lenses, and on the other two I used the kit. If I had just 1 bmw, I would get new lenses. But on 3 bmws lol, completely rebuilding them, money becomes the limiting factor if time doesn't.
Biggest and best upgrade I did though, were new projectors