Two years ago I wrote a blog post titled "This Home Inspector's Love Affair With Flashlights", wherein I gushed about my new Fenix TK35 flashlight. Over the past two years I've tried a number of other flashlights, and I'm happy to say that the Fenix TK35 is still my go-to flashlight, but if my dream flashlight ever gets made, I'll kick the TK35 to the curb. I'll come back to that. Today, I'll give my two cents on a few other LED flashlights that I've tried. The flashlights below all use the same 18650 lithium ion batteries.
By the way, this is a home inspectors perspective; if you're looking for technical flashlight reviews, check out CandlePowerForums.
Armytek Barracuda XM-L2 (Warm)

This is an extremely impressive looking flashlight that feels great in your hand and could easily double as a club. With a stated max light output of 1240 lumens, it's the brightest of all the flashlights mentioned here. It also had a very warm light output, which means the light looked yellow-ish, not white or blue. The flashlight comes in a padded case along with batteries, a belt holster, two 18650 batteries, an AC battery charger, and a DC battery charger. Not all of that stuff is listed on the web site, so I'm not sure why they were included.
My problem with this flashlight is that it's unwieldy. To carry this flashlight around, I had to use the holster. Once the flashlight is in the holster it's secure and won't fall out, but it's not easy to put the flashlight into the holster or take it out. This is also a flashlight that requires two-handed operation; it takes two hands to get the flashlight out of the holster, and then takes two hands to turn it on, because the on/off switch is located on the bottom of the flashlight.
As a home inspector, I probably take my flashlight out of my pouch, turn it on, turn it off, then put it back into my pouch about 50 - 100 times during each inspection. With the amount of time and effort it takes to get this flashlight out of it's holster and turn it on, the flashlight is unusable. It's marketed as a "Search and Rescue" flashlight; maybe it would do a great job at that, but I wouldn't know.
Fenix TK35

This flashlight is my workhorse. I've been using this flashlight for over two years now, and it has served me well. It has a stated max output of 820 to 900 lumens, it feels great in your hand, and has separate buttons for on/off and brightness.
I keep this flashlight in my tool pouch, so it's easy to grab and put away with one hand. Because of it's compact shape, operating this flashlight with one hand feels natural. You can't go wrong with this flashlight.