The WS2813 is not nearly as widely used as the WS2812B because of its higher price and limited innovation.
It’s fundamental advantage is an additional second data line that acts as a fallback should one controller in a string fail.
All the other WS2813 improvements like a higher refresh rate were silently back-ported to the WS2812, too.
When To Use
WS2813 can be used interchangeably with the WS2812.
Whenever the installation of WS2812 does not allow for later servicing, or when you need very high reliability, then investing in WS2813 and its second data line can be a good idea.
When To Not Use
For hobbyist projects or any other scenario where you can easily replace LED, you do not need a second fallback data wire.
Use the WS2812B instead.
Datasheet
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(content created Mar 04, 2024 - last updated Mar 19, 2024)