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In low light situations I like to shoot manual because I want to be able to set the shutter speed as slows as I'm comfortable with depending on how steady I am (walking around, crouching, braced against a wall)
During the day this is more tricky because if you move the frame from shadows to sun you suddenly have to adjust your exposure like 5 stops. You waste time and miss shots trying to adjust the aperture and shutter every time you turn around. For this I use program auto (like auto but you can still use exposure compensation)
It also depends on the lens a bit. Like with my 85 1.8 I shoot in aperture priority 90% of the time because 90% of the time I want that lens wide open.
Always use auto-iso. Don't listen to retards who would rather have a blurry shot than accept a little noise. I have noise reduction turned off and it just looks like film grain. Especially in bw photos.
>pic related at 12,800 iso on a full frame