The best value in alkaline batteries is found at Costco. Their Kirkland brand of AA and AAA alkaline batteries are almost free compared to Duracell or Energizer if you buy the big packages and their performance is outstanding. There was at least one topic on CandlePowerForums that had some very detailed, systematic testing of a wide selection of alkaline AA batteries. The Kirkland was at or near the top in every category. When you consider the price, you win.
Given that, I prefer to use lithium batteries in my "serious" lights. Unfortunately lithium AA and AAA are more expensive than CR123A batteries, so I'm less motivated to explore the virtues of many more AA or AAA-powered lights.
Given that, I prefer to use lithium batteries in my "serious" lights. Unfortunately lithium AA and AAA are more expensive than CR123A batteries, so I'm less motivated to explore the virtues of many more AA or AAA-powered lights.