differences between my second and third paper

there were a couple differences between my first and second paper even though both papers were research papers. the first difference is that the 2nd paper i used advertisements and in in the 3rd paper i used articles on websites. another diffrence is the 3rd paper is more of a argumentative paper in the second beaus the second is more of an comparison paper. the last difference I've seen in the papers is in the 2nd paper i talked more one sided while in the 3rd paper i talked about both sides of the argument.