It's random quotes. Marquee you have to sit there for ten minutes and wait for all of the information to scroll by. The average user doesn't have that long of an attention span when surfing.
Random quotes gives the impression of dynamic content. The content changes every page load. So the quotes are usually different and unique.
The customer either sees A, B or C. But not all 3 unless they keep refreshing the page.
It's a pretty big difference.
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