Personally, while I carried a AA pocket light for a while (and still have it as a 4th or 5th "backup" option for luggage), I switched over to the single battery CR123A or 16340 lights. Shorter and much greater power.
Having had to use the older technology flashlights before I retired, I greatly appreciate the better tech and increased output of the the new pocket dynamos.
I originally picked up a couple of the previous 4Sevens Mini's, being the Q-Mini 123 and then the MINI ML-X, both of which have been replaced with the newest MINI MK II.
Foursevens.com
My favorite, though, has been the Fenix E15.
Fenixlight Limited
I was initially using it with the CR123A batteries (which I bought in 12-packs through Amazon), but finally bit the bullet and bought a couple of the 16340 batteries and a charger. It upped the light output on high to 450 lumens, which is plenty for my normal needs. The advertised service life of the batteries for recharging is far beyond anything we used to see with older rechargeable batteries, and I can always have a charged spare at hand, with CR123A backups for traveling.
I had an INOVA AA light for a few years. It was too large for EDC in my pants pockets, and its 55 lumen output was on the low end. Suitable for looking for something dropped in movie theater, or finding your way to the bathroom in a motel or relative's house when traveling, but not exactly a bright light. That, and eventually a high quality alkaline failed and corroded. That's a pet peeve of mine.
Nowadays they make some more powerful AA & AAA lights, but at the end of the day, once you start to carefully consider the reviews of users, and the close cost difference between the AA/AAA lights and the CR123A & rechargeable lights, I've found myself better served by the CR123A MINI's and the Fenix E15 w/the rechargeable batteries.
Overall, while the 16340 battery gives you more lumens (450lumens & 55min), the CR123A battery gives you a longer run time (270lumens & 1hr35min); but at the High/110 lumen position the battery life difference is more pronounced, being 3hr/15min for the 16340 & 5hr/5min for the CR123A.
When I want bright light, I want the option of having a strong light, or a stronger LIGHT, as I'm probably using it to check for environmental threats or dangers, or active threats, and I want to SEE.
Then, as often happens with my small pocket lights, I need to have a 2nd or 3rd backup light available, as I'm always "losing" them in a suitcase, jacket or different pants/shorts pockets (because of their small size).
Damned if you do ...
