Yeah, I have not played in a while so I do not really know everything that updated yet but I definitely know the menu changed and the new 3D tiles and about the Glock, Yes I agree with the random shot which can help in covering your team or just adding extra damage for your team to kill the enemy quicker.
The reason i like the Five-Seven is because the rate of fire and ammo making it easier to use as a sidearm instead of just something to hold after your out of ammo which is basically waiting till you die, The Deagle is good too but it is much slower.
I think he means pistols that are strictly in the game.
As for the pistol, USP. The most compact cost-effective that deals a moderate amount of damage gun.