Leaders?!

What do you think, which unit is more useful, the War Chiefs or the Executioners? I tested it myself, and it seems to me that War Chiefs are more preferable because they are much more durable and have excellent special abilities! Executioners are also very strong, but they are killed too quickly (too much attention is paid to them, and they are also weak). Plus, sometimes it is very useful to use Cyclops, Centaurs, or even Goblin Shamans to quickly eliminate the enemy mage hero, and they also provide initiative!