If aperture, shutter speed, ISO, and other settings end up the same, the photo will be the same. There is no inherent image-quality or dynamic-range advantage to Manual mode versus Aperture Priority with exposure compensation.

The main difference is control:

• In Manual mode, you choose both aperture and shutter speed directly.
• In Aperture Priority, you choose the aperture and the camera chooses the shutter speed, with exposure compensation telling it to bias brighter or darker.

So A/Av + exposure compensation can match Manual exposure at a fixed ISO, but it may not give you the exact shutter/aperture combination you want unless the camera’s chosen value happens to match.

Manual mode can also let you go beyond the exposure-compensation limits available in A/Av on some cameras.

Dynamic range is determined by the sensor, not the exposure mode. What matters is how much light you actually record: optimizing exposure helps you use the available dynamic range effectively, regardless of whether you used M or A/Av.