I have both TS10 and Sofirn SC21 Pro. I use the SC21 Pro more.
pros and cons:
The TS10 button is larger and easier to use. And it ships with a newer version of Anduril 2, that has a lower low mode of 0.02 lumens, than the stock SC21 Pro low of 0.2 lumens.
otoh,
The SC21 Pro has built in charging, an illuminated button, and a tailmagnet. And it can be reflashed to a newer version of Anduril 2, to gain the lower lows like the TS10.
From a modding perspective, the SC21 Pro is 519a compatible, the TS10 is not.
For someone that already has a LiIon charger, the TS10 has a more comfortable button to use. otoh the SC21 Pro is a more complete self contained lighting package.
Some people who dont buy the stock TS10 battery with the light, end up having issues trying to use longer batteries, that interfere with good electrical contact of the inner tube design of the TS10. The SC21 pro does not tend to have battery length issues, though I still recommend buying the stock battery w the light.
The pocket clip on the TS10 tends to snag when placing over a seam, because of the waistline of the light. The pocket clip on the SC21 Pro works better with the straight body, even though its the same clip, and it also carries the light deeper in pocket.
The TS10 user needs to learn to avoid using the bright Aux, to prevent too fast battery drain. This is problematic. The SC21 button light does not have this issue.
Some people think they can lockout the Aux on the TS10 by physical lockout, but this is problematic due to the switch staying active, and if pressed can cause a factory reset.
On the SC21 Pro, physical lockout does not have the limitations of the TS10.
The triple LED beam of the TS10 is very floody. Imo the single LED beam of the SC21 Pro is more efficient. Because it has more candela per lumen, the beam will reach farther and the battery will last longer,
So imo, the SC21 Pro is a more practical choice. It is the light I bring when I travel. And it is the introductory Anduril light I prefer to give to non flashoholics. The TS10 has a few more idiosyncracies, that require a bit more operator education, than the SC21 Pro.