Safe Bet

I have been using Daddario strings (these ones or with a different gauge) since I have basically started to play the guitar.

I have never been disappointed by this brand. Quality is good for a very affordable price.

The strings come in a sealed plastic "bag" that protect them from rust.

The sound is thick, clear and bright and they are comfortable to play with. I use them in normal tuning while many players use them in Drop D or other alternative tuning but it is perfectly fine.

As regards longevity It obliviously depends on the way you treat your gear and on each one physiology but I would say that in my case, playing everyday for at least a couple of hours, I change them every 3-4 months.