for my designs I prefer to control some important things like power etc at the low level.
it's because when a microrontroller is in "reset" all the ports goes to the high level even if now they are floating but not all.
so to avoid a short "enable" of the controlled circuit when the microcontroller starts it's better to enable it with a low level or do not forget to add a pull up/ pull down resistor to the floating port to fix the level when the microcontroller is in reset. (no CPU clock)