Bro the FX is a Synthetic wax, where as Gold Class is a Carnuaba (natural) wax. The basic difference is that FX made from man made synthetic polymers and Goldclass contains natural Carnuaba. The synthetic lasts longer on the finish as compared to carnuaba. The other difference is the looks, which is a purely personal choice.
1st u need to decide u want durability or looks? and then select the product accordingly (also depending on the color of ur car.
Don't forget to properly prep the finish before u apply ur choice of wax. Because the wax is not the everything.
Bhai G my opinion is bit different. Synthetic 1st, and Carnuaba as topper.
I really dont understand, why do ALLLL Lahoris do this inverse???? (1.e. carnuaba 1st and synthetic latter)
I hope everyone remembers this pic (see below) uploaded by V1 on this same forum. Which Clearly says in its LSP (Last step Process) section that Sealant (synthetic wax) 1st and Carnuaba Wax over it.
( first make beautiful skin than protect the beauty for longer time )
The basic objective of Carnuaba or Synthetic wax is the protection. The beauty as u told doesnt come from Wax, the beauty is under the wax. Beauty doesnt come from Wax, beauty comes from proper preping the finish clean and polishing. Wax is just there to protect that beauty. The choice (synthetic/Carnuaba) is urs, either u want the glossy look of synthetic alongwith the extended durability OR Deep warm look of Carnuaba with comparatively less durability. Its the just the tradeoff based on the liking.