I use Nanoweb 10's; they last years (I have 'rusty' fingers...), although, to be fair, I'm a drummer, so don't play my guitars day in, day out. I have a couple of guitars I've not brought out to see daylight for a couple of years, and when I hauled one out the other day, it was still in tune; I played all afternoon on it (Hofner Verithin...). I used to use Fender Bullets, but they go rusty on me very quickly; well before 'dying'. Soooooo... Elixirs. A tad more expensive at the outset, but far and away cheaper in the long run. I usually wait for a 'pack of three, price for two' offers, for instance. I've just fitted a set on my 12-string electric, too (a pain in the wotsit, changing strings on a 12-string, so I like to do it as little as possible...).
Hope this helps...