Does iPhone 12 Pro support dual nano sim

You are welcome.

There is no advantage of one or the other. Instead, use the device appropriate for your region.

Using Dual SIM with an eSIM - Apple Support

Using Dual SIM with two nano-SIM cards - Apple Support

All iPhone 12 models support have SIM capability. For models sold in China, Hong Kong and Macau it will be with dual Nano SIMs, all other regions will use one eSIM and one Nano SIM slot.