There’s barely any, if at all, colloquial difference between the two expressions, and I doubt the idea is to play around with dictionary interpretations. The only thing I can think of, is that you are trying to distinguish between a more authoritative (by means of knowledge) way of sharing information, versus a more down to earth and easier going manner.

On the tone of this conceptually abstract dilemma, I’d place the focus on the recipient of the information, who should not take things for granted whomever says it, and play along the lines of contrasting the information with multiple sources. This is so in real life, and certainly of the forum, where people often write what they (think they) know, but not always know what they should.