Based on the specs from both lights, the TLR-1 will far outperform the X2 in terms of output; almost double the output if the specs for both lights are exact.
The TLR-1 has a 2.5hr regulated which is damn nice, so no diminishing effect of the light dying out; only steady output. Can't find much information about the X2 however in terms of regulation or runtime; but if it's running only off one of those small CR2s, runtime I'm estimating would be around 1-1.5hrs with it's 40 lumen output. Of course, that's depending on the quality of the batteries itself.
One thing odd about the X2 is that it runs off those small 3V CR2 type batteries. They may be slightly harder to acquire than the CR123s which the TLR-1 run off of. But you can most likely find rechargeable kits for both types of batteries.
Myself, I would pick up the TLR-1 as it seems to be a far better performer straight up.
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