Before the Duracells went crappy, we pretty much regarded them as interchangably equal and ordered equal quantities of both them and the Energizers just to hedge our bets against a bad batch, which we did get from both brands from time to time. We (or at least me) tested the batteries before installation and then we monitored their life by testing. After they dropped below around 7 volts, we recycled them. Our mics claimed to be good down to 6.2 volts, but I never wanted to chance having one go out on the air. There were a couple of lazy guys who wouldn't check batteries that had this happen to them, but it never did to me.
On average, the Energizers lasted two days in the two heaviest used mics and the Duracells wouldn't even make it past the morning show after they got crappy. That was also the same performance we would get out of bad batches of Energizers, which we curiously stopped getting after we went to them exclusively. We went through a few cases of Duracells that were all bad before deciding to not use them anymore. When we had bad Energizers, it would just be a single box or a few batteries, never a whole case.
For personal use, I use rechargbles, but it wouldn't work for TV: too many irresponsible people in the chain.