[Agema]

Vanherse have one huge advantage over Vanjarls: the price.

Ultimately, you need money for a lot of things, and buying 280gp Vanjarls instead of 160gp Vanherse will severely damage your ability to afford those things. Particularly, you've got good stealthy troops - they really should be moved around with a good stealthy commander. One of the most dispiriting things for an opponent facing EA Vanheim is having no idea where many of their armies might be.