You will use different sources to make different types of appeals. No one source will likely provide you with all the information you need to make different types of appeals.
You will want to appeal to Ethos, Logos, and Pathos, and different sources will help you in doing this.
On the first tab on this guide, you see the photo of a starving polar bear. The picture of the bear tugs on your heart, and is meant to encourage you to see that climate change has real consequences.
This works on you in a different way than a statistic would.
Text can provide you with additional information.
Think about some of the different sources listed on the right. How do they differ?
What type of information do you get from a peer-reviewed journal article? In what way might a first-person narrative give you different information? Which source works for the purpose you have in mind.
There is no one perfect source for every need.