Better the devil you know than the devil you dont.

Better the devil you know than the devil you dont is an idiom when is referring to a choice you have to make which is difficult because both choices are unpleasant. The meaning of the phrase is that it is better to choose the choice which is more familiar to you than one that isnt, even in the case when both choices are very unpleasant. The unfamiliar choice is more likely to turn out worse than the familiar one.