Do you mean the Streamlight Stinger rechargeable? Or the Streamlight Scorpion. I believe the Scorpion is a more likely comparison to the SureFire 6P.
If it is the Scorpion that you're talking about, then I would say as a side-by-side comparison, my opinion is as follows (although they both share a lot of features, i.e. size, weight, comparable light output, etc):
Streamlight Scorpion
* metal bezel, rubberized grip surface texture for the body.
* able to alternate between flood and spot by a turn of the bezel.
* comes with clickable on-off switch on the tail.
* can also slightly depress the tail switch for tactical dead man's switch.
* light bulb is easily replaceable, and much more cheaper (about $4.95)
* Scorpion costs about $33+ tax.
SureFire 6P
* 6P has a quality metal body throughout, although Nitrolon versions are available.
* 6P has one of the whitest, fixed spot for any comparable sized flashlight.
* comes with tactical dead man's on-off switch on the tail, but SF offers a clickable switch.
* lamp assembly is going to cost about $15+ if you need to replace it.
* alternate high output lamp assembly is available.
* price hover's around $53+ for the 6P, but you can get its brother (G2 series) for $33+ tax.
* more options are abound for the 6P, available through accessories and the like.
I own a pair of Scorpions and a pair of 6Ps (and other misc SF 2-cells) - I think they're both reasonably comparable in quality and light output, my two minimum qualifiers for a tac flashlight. I've only replaced the lamp assemblies for the 6P and Scorpion twice, each. The 6P's damage was from operator abuse. The other two (Scorpion) were just plain burned out.
ahem... now, if you were talking about the Stinger, and not the Scorpion... ehhh, disregard. Thanks... /ubbthreads/images/graemlins/grin.gif