for high drain devices Lithium (Energizer Lithium AA) (although costly) is ALWAYS best in a single charge (but there not rechargeable) but in the long run it's very hard to beat NIMH rechargeable batteries 'overall'.
im still using the original set (the ones that came with it "2x AA 1800mah" no name) of batteries on my Logitech MX700 wireless mouse... which i had since around Dec 2003/2004 and that mouse is in use alot to (i can tell there running out of power faster than when they where new, but there still easily within usable life so i have no real reason to replace them right now)
in general it's almost stupid to use Alkaline batteries over NIMH battery's nowadays unless it's for something that lasts a long time on a single charge like a remote control for your TV etc... but if it eats battery's even moderately fast then NIMH is the way to go... but if you got something that a pair of AA's last several months or a year-ish then Alkaline aint a bad choice overall since even though technically you could recharge the NIMH you probably would not get any noticeable benefits from it within a reasonable time frame.
Digital Camera's are FAR better on NIMH than they are on Alkaline battery's... not only on a single charge but since NIMH can be recharged alot it's just flat out better in the long run... i.e. saves you alot of money in the long run.
p.s. it's funny how Energizer and other company's never advertise rechargeable battery's lol ... cause they would lose out ALOT of money if they sold those instead of standard Alkaline's.... cause i would say even under fairly heavy use most of those NIMH will last you AT LEAST 1 year+