Which Haven heroes do you prefer?

Try the strategy with Axel. Paladins are divided into 3 stacks. The second upgrade is used to attack two stacks at once. They move early, so there's an opportunity to attack 6 stacks at the beginning, and the Tactics skill is beneficial. With Axel in command, it becomes truly powerful. In a week, with just one gold mine, without harming the economy, I could train 7-8 paladins.