I have both the Olight SR90 and the Fenix TK70.
The SR90 throws further with a tighter beam, but with a large spill that does allow you to be able to see where you're going, as well as what's off in the distance.
The TK70 throws a massive wall of less focused light, but not quite as far.
I really like both lights, and depending on your use for them, either could be perfect.
Its a lot easier to use/charge the SR90, and the battery indicator lights work perfectly to allow you to check run time left, etc. I had to buy NiMH D cells/charger to use the TK70....which is a hidden cost if you don't already have those items. On the plus side for the TK70, adding another 4 D cells is about the cost of having an extra battery pack send by Olight if purchased new...but considerably cheaper than if you were to buy a new SR90 battery pack separately.
That means that once you have the charger, you can add all the run time you want by just getting more D cells (Tenergy Premium - White - 10 Amp work best I find).
The SR90 pack recharges quickly, and can be charged by your rig's cig lighter, etc...so, in practice, as both lights have great run times, its rare to actually run out...but if concerned, the adding of D cells for the TK70 is easier than getting a second pack for the SR90.
I do emergency response work, and use both lights...and if the range is less than 300-400 yards, the TK70 is a better choice for me at least...as it covers a wider area with a large hot spot.
If the range is 400+ yards, I need the SR90 to get enough lux on target to resolve what I'm looking for...as the large dispersed TK70 beam is out of meaningful range. I eventually de-domed the SR90 to maximize that ability.
I just got a Varapower Turbo V2, but, by "just", I mean yesterday....so I have not had a chance to do comparative beam shots (Its raining).
Olight SR90 shot down a Power Line Right of Way (the telephone poles are 73 meters apart from each other, for scale):
Same scene, with Fenix TK70:
TK70 shot at tree at 405 M distance
SR90 Shot at same tree at 405 M distance.
Reference shot of same tree from unzoomed perspective (SR90 Shot)
So, you can see what I mean about the differences in lighting...close up, the TK70 is more useful...you light up a wide area at once, and can still see out pretty far. (Look at the telephone poles..and how brightly the two lights render them)
In the ~ 300 M range, the TK70 is going to give you the whole field. Isee the poles, but also the path to the side, the towers, etc. If I had to tell if that 4-5th pole was there...or if a wounded person was laying on the ground further away than that...the TK70 would not help me as much, as the light reaching that far is not able to generate enough lux to resolve a bush from a man, but the SR90's more focused beam will do it if brought to bear on the target.
I
Two tools, each with strong points that lend them to different scenarios.
Note the above pics are with a crappy point and shoot camera...and that in real life, the scene was very sharply rendered, and detail was easily discerned. So the much brighter pool of light off in the distance really illuminated what was out there a lot better than the two blurry pics would seem to indicate.