Testimonials are the last thing a visitor reads before they decide, and usually the worst-formatted block on the page. A static wall of quotes gets skimmed. Motion buys the two seconds it takes for one of them to be read properly.
Testimonial Marquee is the wall of love: rows sliding past on a loop, the second row travelling the other way, everything holding still while a visitor hovers a quote. Animated Testimonials is the opposite shape, one face at a time beside its quote, for when you have a handful of strong ones rather than fifty.
Between the two sit Testimonial Carousel and Quote Frame Carousel for a row the visitor steps through, Testimonial Grid for a wall that reveals as it scrolls in, and Framed Testimonial for the one quote that deserves a section to itself.