Can you give us any more information regarding what it is you are comparing and contrasting? That would help us to help you by coming up with more suggestions for a more focused thesis statement. However, I agree with #2: a Venn diagram would be an excellent place to start and would help you to think through the similarities and differences.
When you are contrasting two topics you are focusing on what the two things you are considering do NOT have in common. To start thinking about this type of essay you could create a list or a Venn diagram that helps you brainstorm what the two things DO have in common and then the features they don't. Once you have a list of things they don't have in common you need to create a thesis statement. Your thesis needs to make a point about how the two things are different-- it needs to say more than just the fact that they are different. For example, if you were going to compare two kinds of fruit you would need to argue some point of significance about the difference, not just say that "apples are different from oranges." A thesis statement on this topic would argue that apples are a more healthy choice of fruit due to XXXX factors.
Here is a link that can provide you with more help.