I believe it's a group of people that run for fun.
At any given current the XM-L will output more light so unless you really want a XP-G or it is significantly cheaper then taking the XM-L is a no brainer
My recent beamshots thread will give you good comparisons between XP-G's at 1.4A (neutral and cool white), and the KD C8 XM-L at 3A, and a P60 Fake L2 XM-L at 3A. Note the Palight linked above is the one I bought but swapped the driver to a Nanjg 1.4A 3mode as it was way overdriven as I received it.
-Garry
How about a Keygos KE-5?
It has High-Mid-Low-Strobe-SOO. You don't have to run it on high, running it on mid gives plenty of light, will last for quite a while. Low is sufficient if you have your eyesight tuned for night/low light. High is plenty light for short bursts, that don't really have to be that short.
Actually, for most of my uses I'd prefer KE-5 with even a lower low. I'd rather have High-Mid-Low-Very Low-Strobe than that idiotic SOO. SOO is a mistake plenty of Chinese budget light manufacturers persistently do not correct. 
If you carry a spare cell or two, KE-5 definitely won't disappoint.
Viktor
Welcome to the monkey house, Liongsan!
Hey guys,
Sounds like some of the OP requirements are similar to mine, except I plan on using the light on my mountain bike. Any specific suggestions on the 4-5 different options that you would suggest for MTB light?
Cheers