User blog comment:Word Bearer333/Best Space Marine Legion?/@comment-171.33.192.152-20140616150652/@comment-25451195-20140926090359

Grey Knights are not a Legion, Legion in general talk means the original 18. However, Grey Knights do rock some serious socks. But the Ultramarines have a titanic resource base to gather from... there is strength in numbers, they also have some "innovators" in their actions (Ventris,Titus for example) who always change things up in ways that shake things up.