OK. Here goes.
Surefire C2: Incandecent
Nuwai ALX-352L: Lux-V LED
Surefire C2: P61, 20 minutes to 50% slowly dimming
Nuwai ALX-352L: Almost as bright, 60 minutes on high (one of 3 levels) regulated before instantly shutting off. If you wait a minute after it shuts off, you can quickly flip to the low setting and use the light a little longer.
Surefire C2: Momentary with twist on/off
Nuwai ALX-352L: No momentary, 3 levels of light (high/med/low) with a 4th function of strobe (blink)
Surefire C2: Has throw
Nuwai ALX-352L: throws about 60% as far as the C2 but has more throw than almost any other Lux-V (except for an Aleph 3)
It depends on what you want from a flashlight. If you want throw, get the C2. If you want brightness with runtime, get a Nuwai ALX-352L. If you need momentary, get the C2. If you want to run 2 rechargeable R123's, get the Nuwai.
I hope that helps you make your decision.
Jeff