Some observations: Wurkkos with only 3 LED’s is not as bright as Sofirn or Emisar; no big deal and I overcome this by setting it to one-click-to-Turbo. If you do this then it’s even more crucial to reset max thermal limit to 55 or so (ie 25 clicks). Wurkkos is best at reproduction of the neutral daylight look IMHO.
I still love Sofirn SST20 4000k’s warm yellow tone, in some way prefer it to Nichia 219b’s famous magenta/rosy tint. I go back and forth about the green tint and its significance all the time 
. It’s there especially when I COMPARE beams versus the magenta Nichia’s on white wall, and I imagine it’s there when DUV is measured, but by itself in real life it’s harder to notice. Where SST20 wins over the magenta Nichia’s is the warm yellow tone seems to show depth of objects far away better (ie higher CCT light flattens depth), and as a flashlight the Sofirn IF25a is better than both Wurkkos TS21 and the Emisar because it is more balanced: it has both flood, and a reasonable throw. It’s a home-run of a flashlight and a must-have for its warm CCT tone IMHO.
It seems to me the Emisar’s 219b’s magenta/rosy tone is more prominent when it is dim, such as at the spill of the beam, and less when it’s bright, such as at the hot spot. This brightness-dependent tint change (I’m not the first to report this tint change; someone a lot more experienced lol has made similar observation IIRC.) could be seen when you watch while dimming a Nichia light from high to low. Nichia 219b very nicely depicts color details of plants & flowers, etc. up close. Whereas SST20 4000k covers everything with a yellow tone, Nichia 219b 4500k distinguishes colors better: light green vs dark green of the leaves, light gray vs dark grey vs brown of the barks. I too love this legendary LED and totally understand the obsession (grin). It’s a must have, more so than any other light in my modest collection.
Basically, I love all 3 lights and all 3 LEDS for the different things they excel in and recommend all 3 highly. IOW sorry, you should buy all 3 .