There isn’t one best mode for every situation; many photographers switch depending on what they need to control.

• Aperture Priority (Av/A): Often the default choice because it lets you control depth of field. It’s commonly used for portraits, macro, and general shooting where background blur or sharpness is important.
• Manual (M): Preferred when lighting is tricky or needs to stay consistent from shot to shot, such as stage lighting or when using off-camera flash without TTL. Manual prevents exposure from changing as you reframe.
• Shutter Priority (Tv/S): Useful when shutter speed is the main creative concern, like action, telephoto work, or panning with motion blur.
• Program (P): A good flexible mode when you want the camera to handle most exposure decisions but still want access to settings like RAW capture and flash control.

A practical approach is: use Av for most everyday photography, Tv when motion matters, M for difficult or controlled lighting, and P when you want speed and convenience without using full Auto.