NXT/Zymol
Now those are two very different products!
NXT is a new poly sealant.
Zymol: Carnuba& oils wax.
NXT: Easy on/off. Lasts much longer than pure Carnuba. Very durable.
Zymol: Also easy on/off, limited durability (carnuba) but very glossy.
You also may want to read reviews on Wolfgang Sealant. Has the durability of a sealant and a more warmer carnuba look.
Problem with most sealants, they can have a tendancy to look very clean and shiny and some say it looks like plastic wrap around the finish. Lacks depth, but VERY CLEAR. Zaino is known to be one of the better sealants. However it requires a very perfect finish as it highlights all defects. Newer sealants now are starting to look more wet/deep like carnuba.
Another very good sealant: Klasse twins!
Pearl white will look very bright with NXT. If the car is kept outside NXT will be a better choice between NXT/Zymol.
Please search through the forums as there is quite a bit of info as some posts may have already answered your questions.
Regards,
Deanski