>>488802861. Playing in a 3-stack is likely to put you against other 3-stacks, the difference being the enemy will actually communicate with each other to coordinate and strategize while /pug/ is pretty much a bunch of autistic randos that just know each others' names.
2. /pug/ Actually kinda sucks at the game and most of them aren't much better than solo queue randos.
Myself included. 