A hint to decide is to check the windloads.
AQUAPANEL® Cement Board SkyLite is developed specifically for use on ceilings in indoor and outdoor areas (with wind loads of up to 1.5 kN /m²).
AQUAPANEL® Cement Board Outdoor is to be used in outdoor ceiling areas when the wind load is higher than 1.5 kN /m².
AQUAPANEL® Cement Board Indoor is recommended for interior ceilings in humid and wet areas.
The maximum load depends on the sub-structure, and it should be calculated before installation.