The best engineered solution is the Surefire. It has a spring loaded contact in the head that is also buffered from recoil by a polymer pedestal, like all Scouts. Cloud takes the battery jack approach, but this is more issue prone, as it is not a passive solution. Streamlight is a well assembled Chinese product. Nothing really innovative, but their reputation is solid, minus their remote switches. Modlite is the simplest American option. It's just a quality die, reflector, and driver smothered in epoxy with a spring on the back as a contact.
Digging deeper...
Cloud and Surefire are the only ones to offer dual fuel single cr123 lights.
Cloud pushes roughly 2x the lumens of surefire, but also at 2x the amps. 3ish vs 6ish. For the single cell 18350 lights, this becomes a runtime consideration.
The surefire ecosystem allows use of unity tactical and surefire switches, which currently are the only IR/Crane integrated options (we won't discuss streamlight here, due to their track record with tapeswitches).
Ultimately, the trend is for "mini" scout lights to be the size of the OG fullsize models, by and large, all save for the Malkoff and Modlite 18350s, which won't take dual fuel. I have tried them all, and prefer the Cloud 3.0 Micro and Surefire 340dft. The surefire allows more switch options and has an integrated mount, while the Cloud has much higher lumens, but similar lux, at a 100% more amp draw penalty. Not insignificant.
This is my current setup.
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