These are my small keychain lights. Sofirn SC01, Nitecore TIKI UV, and Rovyvon Aurora A5x (the Olight i3 is just there for size reference).
The Nitecore TIKI has a 365nm UV main beam and 2 high CRI side lights. The regular TIKI models come in various configurations with different side light combos and GitD bodies. I had an older TIKI, which was replaced by a Rovyvon. I lost the TIKI one day, and weeks later saw a neighbor had found it. I mentioned it to him, and he gave it back to me, but after a moment's thought, I gave it back to him, and showed him how to use the various features (he was only using the momentary turbo). My one beef with the TIKI is that it uses PWM dimming on the lower levels. At least my old one did. I assume the new ones do as well, as my new (and by "new" I mean that they only came out with it last month) TIKI UV still uses PWM on the low level. Not a big deal, since I primarily only use the momentary high, but it was certainly annoying on the regular TIKI for low level light usage. Still, it packs a lot of light and a lot of features in a small package for only ~$20.
The Rovyvon is more expensive than the Tiki (Nitecore and Rovyvon are part of the same company, as well as Jetbeam), but I believe the extra cost is well worth it. Slightly bigger, but still small, the 650 lumens absolutely trounces pretty much any light available at this size. This one is the A5x, with green GitD body (A7 glows blue), 2 high CRI side lights (2 levels), and a UV light that's pretty much useless as a UV light and really only serves to charge the glowing body. I also have an A8x, with high CRI 450 lumen front light, a high CRI side flood light, red side light, and 365nm UV light - since the body is clear rather than translucent, the UV is actually useful for counterfeit detection and the like. 450 lumens obviously isn't as bright as 650, but it's still a ton of light from a small package, and the high CRI is more pleasant than the cold white of the brighter version. The Rovyvon Auroras - the new ones at least - also have zero PWM flicker at low levels. The website says that they do use PWM (improved on new models), but it's absolutely unnoticeable.
The Sofirn SC01 is a real dandy. Stainless steel body and uses a tiny 80mAh 10180 battery. There's a number of similar 10180 battery lights out there; MecArmy X2S, Olight i1R, Trustfire MINI2, Lumintop Pico (possibly the Fenix E02R - it's similar but I don't know if it uses a 10180 battery). The Sofirn SC01 is the brightest, with 330 lumens, plus a 10 lumen low. The 330 lumens from a 80mAh battery obviously trades runtime for brightness (assume ~10 minutes or less), so it's better to think of it as a 10 lumen light with a 330 lumen emergency turbo. I don't know what runtime is on low, but I expect it's a few hours at least. The other great thing with the SC01, which also seems to be a feature common with the others above, is that unlike many twisty head keychain lights, which require you to quickly twist it off and back on to switch levels/modes, you simply twist it on for low then keep twisting it more for the high. I have a very old Muyshondt (before he started using the Muyshondt name) that has this function, and I've missed this simplicity and ease in a keychain light since. The feature that I like the most about the Sofirn, which the others I mentioned don't have, is that it has the Luminus 95 CRI SST20 4000K LED, which I find to be ideal for every day use. The tint is warm and natural and pleasant, whereas the others all use harsh cool white LEDs.
Gary W. Graley
I recommend you check out the Sofirn SC01. I know you're a fan of low-cost, high value gear. It might not be as dinky as your new Olight, but it's still extremely small and much more versatile.