User blog comment:IceFireWarden0/Elder Scrolls VI- An Analysis/@comment-5185283-20121219005329/@comment-5790858-20121221045713

Well if you're relatively good with Sneak, Chameleon is more useful than Invisibility. Going invisible makes you almost undetectable, but it wears off if you do anything at all. With 50% Chameleon and a decent Sneak skill, you can assassinate everybody in a room without ever becoming visible. There are advantages to both.