"New posts" seems to refresh fairly often, and so may not show all new posts since your last visit - which is why I prefer the "today's posts" option better. "Today's posts" includes all new threads and posts in the past 24 hours.
I do believe that people may miss posts when they only use the "new posts" option - that is why I, when I first visit the board, go to "Today's posts", and start at the oldest ones to try to make sure that threads don't get over-looked.
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