OEM sintered if you can get them, refresh the fluid if it’s old, clean the rotor, get a bigger/radiator rotor, get on the brakes less, eat fewer pies yada yada in that order.
The pads play one small part in ensuring you dont run out of braking power, have you ridden that descent before and if so is this the first time you’ve ran out of braking power on it or has it happened every time? That’s important.