Sealant and polish are two vastly different things, used for very different purposes. Many people use the word "polish" to mean the final protection step (this is actually quite common in the UK and the American South) but to most people the word "polish" describes a product with some level of abrasive that is used to correct defects. To others a polish is specifically the fine finishing abrasive used following a more aggressive compound. Think of these as varying grits of sandpaper - you use the coarser stuff to remove a lot of material and the finer stuff to bring up the smooth, high gloss finish. Only compounds and polishes are nowhere near as aggressive as sanding, obviously.

Waxes are often mistakenly believed to correct defects like fine swirls and scratches. Even a decent cleaner wax usually isn't strong enough to impact those sort of issues, but they can remove dirt embedded in the pores of the paint. Some waxes can do a decent job of hiding fine swirls, but the concealment is short lived since wax starts to break down pretty quickly and rarely lasts more than a couple of months (I don't give a rat's backside what any wax company tells you - nobody makes a carnauba wax that will last a year on a daily driver. Nobody. Period.).

Anyway. The real question I believe you're asking is "sealant or carnauba - pros & cons". Both synthetic sealants and carnauba waxes serve the same purpose; to act as a sacrificial barrier that temporarily protects the paint from potential damage caused by hard water spots, bird droppings, industrial fallout, UV, etc. But if you think it will stop everything in it's tracks, think again. A bird dropping can literally etch down into the paint, causing serious damage. In order for a wax or sealant to fully stop this action it would have to be stronger than the paint itself. That's asking a hell of a lot from a product you wipe onto the paint, let dry and then wipe off the excess, leaving behind a layer a few microns thin that breaks down and wears down in a matter of months (depending on exposure). Sealants, as a general rule, will last longer than carnauba waxes and provide better overall protection. But some people complain that sealants make paint look like it was wrapped in plastic wrap while carnaubas give that deep, wet look. That's in the eye of the beholder; we all like what we like and nobody can tell you you're wrong for liking what you like. Steak, chicken or fish? Blonde, brunette or redhead (all three maybe?)? Football, baseball, hockey? Dodge, Ford, Chevy?

From a purely personal perspective, I like a good carnauba on dark colors like black, red, dark blue, dark green, etc. On light colors and some darker metallics I prefer a nice synthetic sealant because it can really make the metallic "pop". When I'm going crazy (which is fairly common, actually) I'll put down a nice synth first, then the next day I'll put a carnauba on top of it, giving me the best of both worlds.

But for the absolute highest gloss possible, remove all the defects first - clay, then compound (if needed) and finish with a good finishing polish like Meguiar's Ultimate Polish, Meguiar's M205 Ultra Finishing Polish, or Menzerna PO85rd. For the best of the best, machine apply these rather than hand apply. A DA is great, but if you're skilled with a rotary, nothing beats it. But you absolutely must be skilled with a rotary to finish out perfect with it. Your car will look absolutely stunning after this, and you haven't applied a sealant or a wax yet!

The DA Microfiber System is just awesome!! Greatest thing to hit detailing in many, many years. I highly recommend doing the two steps of the system together as the finishing wax will easily remove any light hazing that the compounding step might cause. But the system loves hard paint, and Crossfire paint is pretty darn hard in my experience. The finishing wax is the easiest wax you'll ever use - wipe off is beyond simple. If you ever have a hard time wiping off this product, if it takes more than a single wipe to take it off an area, I want to know what you did so wrong!!! But that doesn't mean you can't put something else on top of it. M26 is a very nice carnauba, but as such it's not going to be the longest lasting product you'll ever find. NXT Tech Wax 2.0 is much longer lasting and still looks fantastic. M21 is our pro line equivalent if you really want to stick with our Mirror Glaze stuff. But if you're a fan of Mother's Syn Wax, Blackfire Wet Diamond, or anything else, there's no reason why you can't top the DA Microfiber Finishing Wax with it.