You can find some examples, below, of Comparison-Contrast Essays. Most of them focus on the Contrast mode of this type of essay, that is, on the differences between the two items compared, usually showing why one is better than the other.
Big Cities and their obstacles (here)
Big Cities Big Opportunities (here)
Small Cities for Children (here)
The benefits of living in small cities (here)
Living in small cities: a better option (here)
Living in big cities (here)