Let me guide you a little from personal experience.
NXT is a synthetic wax, durable, flat shine, but not as much depth as a Natural Wax, which is GC, a lot of depth, INSANE depth, gloss and a shimmery golden touch, warmth in paint.
No matter which wax you use, be it the most expensive in the world, you wont be able to achieve good results until your paint finish is pure of any sort of above surface contaminants as well as below.
in order to cleanse the paint, you NEED TO CLAY IT, ill tell you what used to happen with me, i got my car in 2009-2010, since then its been on GC, and the paint was smooth as silk to touch, wax would go on and buff off in a jiffy, crazy depth, but then came a time in 2012 when the situation changed, the paint surface got dirty and had tree sap, above surface bonded contaminants stuck with the paint, waxing was not as fun as it used to be, wax was hard to put on even harder to take off, and the touch felt horrible; there was no turning back or an easy solution, so Cheetah here got hold of a clay kit, and well Cheetah again was a happy wild cat.