Which Ulm national units should I recruit?

[PvK]

My empirical experience suggests that against Jotuns, the cheaper the better, and in fact, may as well use independent fodder. Dodging boulders is much more effective than blocking them. Giants do so much damage that Ulmish armor doesn't help much, and it doesn't make all that much damage whether it is chain or plate. However they do have to hit, and they do get fatigued and fearful over time, so the more high-defense (not high-prot) masses, the better.

PvK