With the differences paragraph, it is necessary to begin with similarites. For instance, if I'm writing about how the Samsung Galaxy s9 and the iPhone X are different, I need to establish how similar they are. Both are phones whose most important features include a vivid display and a high-quality camera. You then review the functions for both phones, emphasizing the differences.
Samsung
* Phone Functions
* Display
* Camera
iPhone
* Phone Functions
* Display
* Camera
List the differences from the least important to the most important.
Also, remember to reduce your reasons to just one key word if possible.