I started with Megs; my favorite combo ended with #16 paste. Since that was discontinued, I started playing around with the more elite and finicky products.
Klasse offers an *incredible* finish, but at the cost of many dropped F-bombs "learning" how to apply the Sealant Glaze properly.
Zaino is expensive and was way too hyped for me to use at first. Curiosity got the better of me, I did a full detail on my dad's car one weekend home from grad school. Eight months later, I asked him who he got to do it again. He responded that it was the original two coats that I had applied so long ago. So yes, it's expensive and definitely has its fanboys, but it's a great great product.
Nothing beats the back-to-basics appeal of applying a natural paste wax--synthetics just can't touch it. However, the science is there. Both Zaino and Klasse last and last. If you are an infrequent detailer, those are your go-to products.
And an additional tip: look up and learn how to use "clay." Cleaning the paint to that level will extend the life of any product you put on top.