Given the recent developments made by Penfold42, usual given difference is the WS2812Bs needing an arduino to drive them and therefore more work to set up isn't relevant any more.
What I'd like to know is are the APA102s still worth twice the price, I've read that the gamma, brightness levels and response are a lot better than the 2801s but can't find any mention of how they compare quality wise to the WS2812Bs.
Anyone made the comparison?