Well, actually there's isn't such a thing called "the Best Opening". It all depends on preference, and what kind of position you like. If you play e4, you must be prepared to play an open game, if you opponent plays e5 or d5 or even the Caro Kann, and perhaps a strategic game if you opponent plays the Sicilian. If you play d4, perhaps you prefer something quieter, especially if you play 2. Nf3!
Well, recently we heard about the game of checkers being solved and the winning first move being known. Until the game of chess is solved (please don't let it happen or there'll be no more point!), we should just choose what positions we prefer to play in- i.e. open or closed and then choose an opening that can suit your preferences! Hope this helps..
I consider pawn to e4 as my faviorate opening with the most options for my game. Does anyone have any reasons why there first opening would be better?