although the "advanced" don't hold quite as much juice as the "ultimate", they're often quite a bit cheaper.

i perfer the "ultimates" just so i can have the most juice possibly available within the tool.

lots of threads over at CPF about it. here's one:

http://www.candlepowerforums.com/vb/showthread.php?210335-Energizer-Ultimate-and-Advanced-Lithium-AA

the thread included this useful info::

"...I recently ran the ANSI digital camera test protocol on these cells and got 702 photos with the Ultimate and 465 with the Advanced..."

thus, which is the better-deal has to do with the asking price of each...