I can't recall any batteries since '60s "9 Lives" batteries (the red ones) that leak as bad as modern Duracell alkalines. I would never leave them in something important.

Never had an Energizer alkaline leak, but then I use far less of them than Duracells because I find Energizers don't last as long. I do put Energizers in important stuff, like e.g. my GPS.

Some electronics are voltage sensitive, some are current sensitive. Eneloops for the current-sucking devices, alkalines (or even C-Zn) for the voltage sensitive ones.

Rechargeables in voltage sensitive devices is very frustrating, because after all you're starting out with equivalent to a "dead alkaline".