Number four – it's fresh, unique, and original.
And that's all, really. Number three and number five are just good games. It's a pity that in both of them, the sides started to be created in a completely similar way: "flying unit - mage - ranged attacker - melee unit." And there are also a huge number of dragons in them. In number two, the sixth-tier units are completely different from each other. The exception is Necropolis, but it appeared there for the first time.