Knights. Below is the ideal position that EVERYONE should strive for as White, since 1.d4 sucks and 1.c4 is just plain stupid because it doesn't even place a pawn in the center. 
What piece(s) do you like to get out first?
I ran Houdini to Depth = 22 on White's ideal position vs. f6? and got the continuation below. Surprisingly, from a material count, White is only up by one minor piece after this enormous lead in development. Factoring in the resulting position, Houdini gives White a + 6.80 pawn advantage.
Now it is White's ideal position vs. Black's starting position. White had 10 free tempi, and Black is still fighting, but White has a decisive advantage at +8 pawns.
Last one for tonight.
I have found this little exercise quite instructive and may try playing the following starting position with the Black pieces against my students. Houdini only gives White a 1 1/2 pawn advantage, which means nothing for beginners, including me.
How much opening theory does the beginning chess player really need when even a six tempi lead in development yields only a 1 1/2 pawn advantage?
I've seen three types of openings: 1) occupying the center with pawns, 2) controlling the center from the flanks, 3) ignoring the center.
In the Hedgehog, Black ignores the center, or it can be seen as creating a small center, I think. GM's have played it. In the Hedgehog, Black looks to place pawns on a6, b6, d6 and e6. In this example, the Hedgehog is reached via the Sicilian.

Obviously, I like to get the King out first.