When given a choice, I prefer left justified. While full justification is acceptable with small fonts and/or a large screen to avoid the large gaps between the words, left justification works better with a smaller screen and/or larger fonts.
Since others have commented on paragraph spacing, when given the option I prefer a blank line between the paragraphs with a visible marker between the sections, and no first-line indent. Other ways are fine, but this is the one I prefer.
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