Best of luck. There is no BEST storyline. There are many excellent storytelling games that went above and beyond the established standards of their time and pushed the envelope, but you will never find the single best storyline. It just doesn't happen, if perfection was reached, there would probably be way less or no new games being made. You can argue that Citizen Kane is the best motion picture but for others it will be Transformers or Equilibrium. Good is a subjective term and you just can't define the very best game that 100% of gamers agree on is perfect.