"In my family we say: A naked man has few secrets; a flayed man, none."
--
Roose Bolton is the head of House Bolton, a vassal family to House Stark of Winterfell. He is the Lord of the Dreadfort. Roose takes pride in his house sigil; the flayed man. Although torture is outlawed in the North his family are famous for flaying the skin from their enemies as a means of torture. Roose fought for Lord Eddard Stark in the civil war known as Robert's Rebellion and proved his worth as a soldier in the Battle of the Trident.

vs.

"I always hated crossbows... take too long to load!"
--
Yoren is a sworn brother of the Night's Watch and serves as a recruiter, he was forced to join after murdering the killer of his brother with an axe. His job is to travel the Seven Kingdoms searching for fresh recruits, either willing ones or (more frequently) criminals that choose a lifetime on the Wall over punishments such as death or mutilation.

Yoren for sure!

I hear Roose gets more fleshed out in the books but so far on the show he hasn't made much of an impression on me. Yoren was insanely badass though.