Have you noticed the upkeep of Squires? They are not worth spitting on.

Regular Bowmen are similar to Genoese Sailors. Bohemians are much better by means of their melee ability and range.
And they cannot pierce armour, from what I have seen.

The Spanish Militia are excellent units, similar to Feudal Sergeants.

Certainly the best new unit I have seen and used is the Andalucian Cavalry.
They can defeat any European cavalry and they will destroy all infantry by means of their javelins - the Andalucians are somewhat like strong mounted sergeants with javelins.
They are perfect.