I have both the X300 (170 lumens) and the TLR-1s (160 lumens). Both are great lights and both have their pro's and con's. However, they're both about the same brightness when illuminating up a 30x30 ft room, but the TLR has more spill and the X300 has a brighter hotspot.
There are lots of comparison reviews out there, including videos, but I will say this. The material on the X300 is much more durable, and you notice this when you're shooting a pistol with the lights on it. On my Glock 19, both lights stick out further from the muzzle, and both get quite dirty when I shoot with them. However, everything just wipes away on the X300 but you can see a small hazy 'burn' on the TLR surface. It doesn't affect anything on the light itself, just the finish on the light.
Both are really good lights. Overall, I prefer the TLR-1 because of the way the controls work for me and how the light is emitted, but I like the look & finish/quality of the X300 better.