World at War and it isn't close. It's the most competitive and the most active map with the most players and the most stuff to do/directions to expand. The only major downside is golders or plain elite players are most common on this map when compared to any other map.
Historic World War is unbalanced so it often isn't a true test of skill, and players go inactive like crazy on those maps. I also find it stressful to be given a large nation/empire to manage right from the start.
The doughnut is my favorite round... or maybe a biscuit
"Es gibt keine verzweifelten Lagen, es gibt nur verzweifelte Menschen" - There are no desperate situations, there are only desperate people. General Heinz Guderian(Schneller Heinz)
Kenny says - You've got to know when to hold 'em, Know when to fold 'em, Know when to walk away And know when to run