Red, I've been hanging around here for almost 4 years and don't know the single best answer for that question yet, because there is no single best answer. Knowing what I know now, if I was just starting out, here's what I'd choose: For a daily driver, Collinite 845 liquid or 476 paste, 'cause they're about as bulletproof as any product can be, shy of one of the coating products. For brilliant gloss and reasonable durability, Blackfire Wet Diamond or maybe Wolfgang Deep Gloss Paint Sealant. For a garage queen or show car, I like the softer glow of a wax product, such as Pete's 53, any Dodo juice, Fuzion, even Meguiar's #26 or Gold Class. If ease and speed of application is important, Optimum Car Wax, Duragloss Aquawax or Optimum Opti-Seal. That's only scratching the surface. Beyond that all I can say is to make acquaintance with the search tab at the top of the page and have fun experimenting.
Bill