The thing with any wax is that you are going to get different opinions based on perception. There is no right or wrong answer.
My personal favorite Meguiar's wax remains #26 Hi-Tech Yellow Wax. I LOVE the liquid look that it produces on dark/solid colors such as reds and blacks (it looks nice on all other colors as well).
I used Ultimate Wax several times and I like it but the application/removal can be a little tricky in Florida's humidity. The water beadings (hydrophobic as Meguiar's calls it) is really intense, and when used with their supporting "Ultimate" line of products (the spraywax and quick detailer) really amps up the shine.
I have NXT and NXT 2.0, which to me, look identical to Ultimate Wax, and are a little easier to apply/remove, but don't have the durability.
Meguiar's M21 is the professional version of NXT, although in my experience, it is even easier to apply/remove, and obviously offers a great value.
Meguiar's D301 Finishing Wax is one of the easiest waxes I have ever used to apply and remove (it seriously wipes off without any streaks with just a light pass of a microfiber towel). It also has some polishing ability and creates a very sharp reflection.
Gold Class is another fine wax, and the newest version is easy on and off. It offers that very nice carnauba "glow" in a consumer version, although, it is my opinion that Meguiar's #26 creates a more intense version of the same look.
Meguiar's is one of the oldest and most respected names in car care, and for good reason. I am sure I am missing a huge selection of their waxes, but it is 5 am, I should be sleeping, and I am shooting this off the top of my head. Ultimately (pun intended) you cannot go wrong with any of their selection, although, for me, it would #26 liquid. :bigups