Most of the heat that comes through a car window is infrared light, which you feel but can't see. Standard dyed film mostly blocks visible light, so it makes the glass darker without stopping much of that heat. That's why a dark, cheap tint can still leave the cabin hot.
Ceramic film is built with ceramic particles that absorb and reflect a large share of infrared heat while still letting visible light through. At the same legal shade, a ceramic-tinted car stays noticeably cooler than one with standard film, and the AC doesn't have to work as hard.
Ceramic film also contains no metal. Older metallic films could interfere with phone signal, GPS, radio, and keyless entry. Ceramic doesn't, which matters more every year as cars rely on built-in connectivity.
It also holds its color. Dyed film can fade and turn purple after a few Florida summers. Ceramic film is color-stable, so the tint you choose is the tint you keep.
Is it worth it? If your car sits in the sun, you drive long commutes, you have a dark interior, or you want maximum heat rejection without going darker than Florida allows, ceramic is usually the better buy. If you mainly want privacy and a darker look on a budget, standard film does the job.