The Scenario - You are a young, up and coming player on the ATP Tour. Analysts have put you on their 'one to watch' list, however, they feel you don't posses any major 'weapons', and this could hold you back from being a top player. Disheartened by this news, you trudge off in the rain with no destination in mind, and as the Sun starts to disappear over the horizon and the night sets in, you are approached by a mysterious figure. He gives you the opportunity to possess either Sampras' serve or Federer's forehand for the rest of your career. Now assuming this guy is legit, which option do you take?