3on3 is better when you have good friends and when you say something they actually will listen you and not just being rambo.. in 6on6 its more like chaotic or so if the players dont know tactis or listen ingameleader or so..
In 3on3 you don't depend so much on luck like in 6on6. If you're a poor aimer then you just won't win against skilled guys. In 6on6 only one, even lucky, rifle nade or a panzer shot can destroy your team. And in 3on3, I think, skill counts more and that's why more and more people start to prefer it to 6on6 nowadays.
tell me the time
That's my point of view.