It depends on the beam profile you like.
IRC, the TK35 drops from 820 L down to 346 L after 200 seconds, to avoid overheating. This means that while its turbo mode is really useful and bright, its high is less than half that from 200 seconds onwards, etc.
If you only use the light for short bursts, this is not a problem, and you get that juice for each burst.
Obviously, a light that throttles itself down to avoid damage is a good thing, as you WANT to be able to sprint as well as run/jog, even though you know the sprint will be short, etc...and you NEED to slow down or die.
The X10 is a throwy light with a more narrow pattern, and a higher long term output...so if the light will be on for a while at a time, the X10 will be brighter.
If you WANT a broader pattern, the 4sevens S12 looks a lot like the X10, takes the 26650 cell, and puts out 1,200 lumens in a nice floody beam.
If its to walk the dog, its going to drop to a 346 lumen light a few minutes into the walk...so, to that end, the S12 might be better as well, as it both has a stronger floody beam, and well as a long run time.
YOU need to decide what beam profile and output makes sense for YOU, as, otherwise on this type of thread, people will just tell you to get what THEY like.
