get some training/practice with the RDS and you'll end up faster and more accurate both at all distances. up close you don't need ANY sights for defensive accuracy anyways. It takes some time to adjust your presentation to the RDS but it's just a physiology advantage when your eyes don't have to shift focus to line up with an iron sight, it's really just better. not that Irons don't work fine too and have for a long time. but if your actually aligning the sight(s) it takes 1/10ths of sec at the very least, time that a RDS cuts out.
But this thread is about lights.
I'm happy with TLR-7HLX for carry use, my primary use of a pistol. It's a lot of power and throw and I've had better reliability with streamlight than I have with Surefire. small samples of both but that's my experience of actually shooting once in a while in low light and carrying a pistol daily. My Surefire XSC failed multiple times and was warrantied becuase the battery retention is a shit design. the extra size of the HLX is well worth it IMO as it's way brighter and so far has been reliable, haven't been carrying it for long yet. it's all the light you need for duty use but I can't attest to the run time, doesn't concern me.
My X-300 clamp bolt sheared, no issues with the electronics but I've been lazy about replacing the bolt so I haven't been running it.
Olight are affordable, and bright/good specs, but not well regarded for reliability amongst instructors who see a lot of lights come through classes.