Sorry, no experience with the 5.11. Looks like a large light for only 90 lumens, but I do like the fast recharging time (90 seconds!).
As far as Streamlight, I had an issued SL-20XP once and didn't like it one bit. It felt cheap, was so light that it couldn't be used as an impact weapon (side benefit of most large lights), and its body would get pretty hot. The outside polymer cover actually bulged and ended up sliding over the end cap, preventing the light from being removed easily from the wall mount (the trim job I did was just a temporary fix).
Everybody on the detail liked my personal MagCharger I brought there much better.
I'm not a polymer light guy, but that may be simply because there's usually an all-steel gun in my other hand...