What is the best weapon in counter-strike global offensive?

The AWP for sure, the AWP | Pink DDPAT along with a USP-S | Orion.

Its just the ak because the onetap on the head is so ez

really really really the best is ak-47 1 reson its the headshots with helmet or without helmet, it will be HS

ak-47 headshot and the enemy is no longer there, or the AWP in skillful hands is a very useful weapon

I prefer AK47 because of the one shot headshot, but the recoil isnt that easy to learn xD

awp - ak47 - m4a1-s :D and try to use fiveseven and cz for ct and t sides

AK47 and Knife i am then a god i am an ninja around corners and can aim like an ak 47 .-.
but AWP is also a good choice if your reflex are sharp

The weapon is M4A1 ahahah but the M16 is a good weapon with silent.

I like AWP because I hit like 95% of my shots. I am a good player so listen to me xD