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Higher voltage doesn't mean anything about resulting brightness. WS2811 is just a driver IC, while WS2812/B come in a single package, usually a 5050 SMD LED. APA102/SK6812 are chipsets/leds from other brands, WS in WS28xx stands for "World Semi".
But I doubt any of them will be noticably brighter. But if so they'll draw more voltage and/or current and you have to make sure you're using the right wire gauges. I wrote a lot about possible power requirements in the instructions already.
Unless you're trying to light the moon ws2812b can be pretty bright. Unless someone decides to print the diffusers in white PLA or anything, that is...
Using WS2812Bs and the default sketch with its power limit this thing is readable if lit directly by a 250W studio light. The reason I added ldr support was because even the lowest brightness is enough to slightly light a 30m² room at night... i wonder why people always want something to be brighter, without knowing how bright it already is... if you're looking for something to be readable in direct sunlight this is the wrong thing for you either way. You'd need a few Watts per LED and this design won't survive a power draw of 20 Watts per digit...