Dynamic Queue and Solo Queue

DQ sucks SQ rocks

One is booster's heaven. The other is an actual game mode.

Dynamic Queue is a system that matches premades and single players together based on their average MMR compared to the enemies they will be fighting.

SoloQ is where you alone are queued with 4 other solo players based on having about equal-ish MMR vs enemies with about the same MMR.

So Dynamic Queue 1 person might be stuck with a 4 man premade, or 2 people with a 3 man premade, or a 2 man premade with a 3 player premade group. While solo it is just 5 individual players not premade.