Unno, the only headlamps I have are RJ02s, work fine for me.
AAA/AA lights? SP10, not sure if A or B, and/or a TK05. AAAs are too small for me to count as an actual light, except as a zipper-pull or something.
18650? Depends if for flood or throw. To me, those are 2 way different lights. And in-between would be a 3rd.
Candidates? For throw, C8 variant, dunno which. C8A or -F, most likely.
Flood? Frankly, I just handhold my RJ02 (replaced the come-with TIR with a wider-angle one) when I want wide-angle. None yet, but a S2+ triple might be nice.
In-between, there’s my ’502, only now that I’m getting jaded with 1klm donks, it’s seeming a bit anæmic lately, so I might have to upgrade it. Still 1-mode, though. 
For a multi-use light, Frankly, I’ve been liking that UT20 a lot as a dual-switch light.
And that’s not even counting any Q8s, L2s, Jet-Is or -IIs, DV-S9s, etc.