Mysteriously, you have asked which photo of you looks best but have neglected to provide a choice of photographs for us to choose from. No matter, when it comes to choosing profile photographs, and indeed photographs of people more broadly, there are two rules that always apply:
Rule 1
Smile! Unless you're a supermodel with cheekbones you regularly cut yourself on, you always look better when you smile. To illustrate this, in the 1982 film Annie, the point is hammered home that You're Never Fully Dressed Without A Smile.
Rule 2
Context is all. Where you are, the setting and background, say almost as much about you as your face. So, profile photographs taken in the toilet belong there too. Also remember that pictures of you in bed are not provocative - at least not in a good way.