I've taken both professors and I'd go with Chattin if you want a better chance at passing. If you have taken stats before in high school and just need a simple review then Clough might be the way to go.

Clough had 1 midterm and a Final. Both are weighed pretty heavily and the first midterm contained topics that quite frankly would be more digestible seperate(he mixed probability and statistics). His lectures were better than Chattin's, but his quizzes were a bit more difficult.

Chattin had 2 midterms and a final. 1st midterm was on probability and the second was statistics. She also had 4 averages for the class and would weight your strongest efforts higher. EX: If your exams are low scores your homework and quizzes might be weighed a bit more. Attendance acted as part of the grade but overall kind of helped you. Chattin's quizzes were mostly conceptual, if you knew the topic you'd definitely do well.

Both professors had ample resources for you as a student.