Identifying good vintage bikes

Hi everyone I need help identifying some good brands and models of vintage bikes to keep an eye out for. I always see people post Puegeot restorations so I am guessing they were good. But we're they all high quality https://showbox.bio/ https://tutuapp.uno/ https://vidmate.cool/? I'd like to know what else is worth searching for. I am looking for some steel maybe titanium tubular frames that would have a more classic look to them and be fun to restore and casually ride around on. I'd love to hear your input.