Many of the smaller cameras and the SLR cameras offer the choice between M for manual, A for aperture priority, S (or T) for shutter speed priority and P for (programmed or) ISO priority. The guests on photographic safaris, wildlife photography courses and team building photographic safaris often ask which of them they should use for which situation. The answer is, that it depends on what suits the user the most, on which what can the user connect the best.
We can all drive a car (at least almost all), but we prefer different ways of driving. One is good in off road driving, another good in driving in sand and again another good in driving on race circuits. It depends on talent, skills and preferences of the driver.
It’s the same with the camera settings. Some can work best with shutter speed and others work great with aperture. Find out where your strength lies and choose the manual setting that suits you best.