i think my favourite units are:

Longbowman:I just love this guys, huge range, incredibly deadly. What can be better than that?

Spanish Jinnetes:Now this guys are good. VERY good. They just throw their javelins and problem solved. They are deadly and fast, put them in the flank our rear and you have an enemie's army destroyed.

Bonnatchs: They are as deadly as the Jinnetes. Don't have such mobility but are more resistent, I love them *-*.

at last,

Gallowglasses: I don't know what to say about them, I just like them. They are pretty fast, very usefull.