Why do we choose life (to be) over taking our own lives (not to be)? How is this outlook different from Hamlet's point of view on suicide earlier in the play?

I think most of us don't want to die. We want to experience life even at its low points. Death means the end of even the possibility of things getting better. Hamlet, however, is more afraid of the afterlife: what lies in the "undescovered country". He thinks existence may be even harder on the other side.