Here's is my wax choices from top to bottom.
1. Get all the waxes

2. Four Star UPP mixed with PolyCharger
3. Klasse twins topped with P21S
4. Klasse twins
5. Four Star UPP
Klasse has more durability than UPP, but UPP has better depth and shine. This is why UPP is at the bottom of the list. But if you add PolyCharger to UPP then it easily goes to the top of the list. UPP is going to be faster and easier to apply/remove than Klasse.
Autopia also carries SmartWax. I haven't tried it, so I can't comment on it.