They differed mostly <span>in their relationships with the American Indians they encountered. The French built positive relations with the locals and traded with them which helped them get fur and help with hunting. The Spaniards were conquerors and were all about finding gold and Spreading Christianity and they killed and enslaved numerous people while doing it and didn't care about the locals.</span>
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You will have to look at whether or not the creator of the source had a really positive or negative outlook on the situation.
If they are -for example- great friends with a bully, they will not tell as much of the truth, but if they are enemies, they may tell a very exaggerated truth to get them in trouble.
You must look for a very neutral feeling on both sides of the matter. If the author has an opinion, more likely than not it will affect the way they share the information