Powering two stepper motors with A4988 drivers
Both power supplies are suitable.

The actual 12V/24V current required is not comparable to what the driver current is set at, since the stepper motor coils do not have those 12V/24V across them.

My first 3D printer came with a 12V 5A power supply, which proved suitable for simultaneous use of four stepper drivers, the control board, a display, and the heater cartridge (40W).