For Better or Worse?

My sister recently lent me her DVDs of "The Butterfly Effect" & "The Prestige." Totally different movies entirely, except for the fact that one small incident can change a lifetime of events. Sometimes I wonder how my life would be different at certain checkpoints of my life if I just did things slightly differently. Would I (and others) be better off? Or would we be for the worse? I guess all we can do is the best that we can with the knowledge that we have, in good faith, and hope it is for the best.