SFT40 versus GT-FC40, based on the LED’s in different hosts (SFT40 in Sofirn IF22a and Sofirn TS32S, GT-FC40 in M21B, E, and F).
These 2 are completely different LEDs for different purposes, so one is not better than the other (you need to buy both 
). IMHO and based on the lights I have:
1. SFT40 is the much better thrower, really a top-class outstanding thrower. You get this LED for the throw, remarkable 600m plus in such a small and inexpensive light like Sofirn IF22a. But… the hotspot is small and the spill is essentially non-existent, limiting AREA of illumination and making the beam profile somewhat un-balanced, and this is the only thing I don’t like (YMMV very much depending on use of the light). The beam is harsh blue 6500k and CRI is about ~70. For a super-thrower like this personally I don’t care too much about CRI and just a little about beam color, looking at subjects so far away, but YMMV. My measurements here: Wurkkos TS30S + monster LED SBT90.2 = $60 4750lm 1km SUPER-Thrower. Comparison w/ TS30S Pro, Olight, Nitecore, & other monster lights. :)
2. GT-FC40 is medium throw and medium flood. Throw is not as far as SFT40, in the 300m range, but the spill/flood is much brighter and larger, for a more “balanced” beam profile than SFT40. The beam color and tint of the 4500k version are among the most, or probably THE most accurate (Ra 93, R9 76) and subjectively beautiful that you could find for a throwy LED. It looks like a cross between Nichia 219b and 519a, 2 “legendary” LED’s. The GT-FC40 is among my top 3 lights: top CRI values, balanced between throw and flood, excellent all around gift light. I posted some measurements and beamshots here if you’re interested Convoy M21B, M21E, M21F w/ GT-FC40 4500k: 3 CRI-95 324m throwers w/ Nichia-like tint -->3 home runs. Rec w/out reservation :-).