Whats the fastest charging cord and wall block combo for iphone 15pro

It would need, at least:

• A 20-watt Mfi-certified USB-C power adapter that supports USB Power Delivery (USB-PD), and a
• Mfi-certified USB-C to USB-C charging cable.

Ref: Mfi Licensed Accessories - Apple

they max out with 18watt really

and all cables they sell work the same

Charging Essentials - iPhone Accessories - Apple