I like Eneloops and other rechargeables, but for some uses primary (non-rechargeable) batteries are better. For these I use Titanium CR123A or Energizer Lithium AA or AAA cells.

Make sure that CR123A cells in particular are matched (same manufacturer and state of charge) in multiple-cell devices. I use a pulse-load battery tester (this one: http://www.batteryjunction.com/zts-mbt.html) to be sure. If you don't have a pulse-load battery tester be sure always use new cells from the same manufacturer when putting two or more in a device, otherwise you may have a "vent with flame" event.

While this level of caution is a good thing you're very unlikely to have "vent with flame" event in AA or AAA cells.

I have heard one report that Energizer Lithium batteries leaked in a device, but I haven't seen it or heard it more than once.

(I have no affiliation with any manufacturer or seller of batteries)