I have both the Sofirn 10a and b bought maybe 2 months ago and both have the same UI with the firefly mode. They changed the UI for the better firefly mode a little over 2 month ago. Sofirn SP10A 500lm AA $9.99 on Amazon
I also have 2 UT01’s one stock and one modded. Both are working great but from what I have seen unless you can mod the driver, it might not be your best choice even though I personally prefer the UT01.
I have 2 of the ti klarus MI7, it’s another fine choice also in my opinion.