Chancellor is comparable to demon, less mobility options but longer reach I’d place it at 17.

Samurai is, however, comparable to an angel with a LOT more reach, they are definitely the more difficult (and more common) piece to face. I’d place it at 19, since it lacks angel's on death effect.
Favour values them both at 18 but Samurai is definitely better than Chancellor, despite knight being better than camel.