There is no "best" of the three. It depends on your skill you have with the previous model of the weapon. For example, I am a single shotter who uses the M4 variants. I have mastered single shotting with many different types of M4'. Therefore, I would choose the M4 Gold over the other two.
Some have a better experience playing with AK's. That is fine as well. For the sniper's, they would most likely go for the AWM Gold.
"It doesn't matter who the people voted for; they always vote for us".