Which hero do you like?

Double Strike is good, but they move very slowly. By the time they reach the enemy, there might be nothing left to attack. There's no way to increase its Speed.

Pandora, you are greatly mistaken. I have verified this with my own experience. First, Tactics increase speed. Second, the enemy won't stand still. Third, especially against nature creatures (phoenixes, fairies, mantises, griffins), Crusaders are indispensable with pikemen because those creatures fly and can simply block the ballista and monks. And that's already a loss. But with soldiers in the army, they destroy everything around them.