I have the Klarus Mi X6 Ti and it is light as a feather. Not as bright as the XP-G2 lights running on li-ion cells, but very nice. I like the Klarus more than the SS NiteCore T5s.
The OLight I3s is very nice. Square threads, nice beam and (except for the key chain attachment) very robust. The runtime on M is very impressive and this is why I accept the M>H>L UI. It gets hot fast on H with a li-ion, but M is bright enough for most needs.
I also have the Titanium Innovations Illumina CA1-Al, which is very similar to the I3s. The UI is L>M>H, which I generally prefer. No blinkies on this one.
My favorite AAA is the Peak Eiger. I have one with the Nichia 219 mule from Oveready. I have an AAA body when I need longer runtimes and generally use a 10180 body. I also have a large optic XP-G2 N on a ss AAA body, no QTC and a momentary switch. The AAA bodies are not small and both lights are built like a bank vault. I always carry the Nichia 219 mule with a 10180 body because it is so small and useful.
Another favorite is the Maratac AAA copper modded by Vinh with an XP-G2 N. It is flashaholic heaven to feel the whole light get warm running a li-ion on H. The key chain attachment is stronger than it looks - it has never failed. I also have a copper Lumintop Worm modded with a very warm XP-G2 and it also very nice.
Other AAA lights to consider: Dereelight DA3 has a very nice beam but a weird tint, the Thrunite Ti2 has an interesting UI (twist to L, keep twisting to H), the Tank007 E09 is inexpensive and has a more throwy beam and the DQG AA IV is SS and very small (the size of a 47 Preon PO). Clickies include Preon single AAA, Lumintop Tool, LumaPower LM21 and Pelican 1910.