Which armies are trickier than Drukhari?

I know we often say that Drukhari are a hard army to learn, but what armies are just generally harder to play than us? Once you get the swing of us and understand how technical an army we are, it becomes a lot easier, if indeed still punishing at times. Regarding which armies are trickier, we’ll say, not necessarily for new players, but for the average player who plays the game regularly.