CG-NAT and VyprVPN

I have recently changed my ISP. The new provider uses CG-NAT by default, although it is possible to obtain a dedicated IP address at an additional cost of €1 per month. The question is more out of curiosity. Are there any advantages/disadvantages to combining CG-NAT with VyprVPN NAT? Is it better to use VyprVPN without CG-NAT? Does not matter?