don't sacrifice tone for durability. if your strings break you can put on new ones, but if you buy strings only because they last longer, you might be stuck with a bad tone forever. IMNSHO (in-my-not-so-humble-opinion) tone is most important.
I use Ernie Ball strings for electric (.010), they have a clean, bright tone. I had been using Dean Markley .009s before,
but couldn't bend them and cut my fingers (ouch).
Fenders sound awful. don't waste your money on that.
I use la bella for classical. haven't tried elixir's yet, mainly
because I couldn't find them in any music store i've been to.

p.s.: I play blues. (in case you wanted to know)