Well, it really depends on what your goal is. Is it to contrast more? Or to compare more? Is it to show how they are alike more? Or to show how different they are?

If you want to contrast them more, or show how different they are, I suggest that for the first few paragraphs show how very ALIKE they are, and then at the last few paragraphs contrast them so strongly that your readers are left with a good impression on what you want to impart. When I mean ‘strong’, use absolute adverbs and adjectives, like “absolutely, whole-heartedly, without any doubt, etc…”

If you want to compare them, or show how alike they are, I suggest starting out the with showing how DIFFERENT they are; just quite the opposite of contrasting them.

You could really do alot! Hope this helps.