Ernie Ball Slinkies. Gauge depends on the guitar.

I'm a GHS Boomers guy. Custom Lite 9-46. Sometimes like 10-46, but definitely like the fatter low e for tone.

D"Addario XL's on the electrics.
12's on the acoustic, and 16's on the resonator.
I will never ever ever ever buy another set of SIT strings.
Yes, they stay in tune. But they sound like a skillet lid from the git-go, and never change.
 

For steel string acoustic I used to swear by Martin strings, gauge 14's (I used to play with steel fingerpicks and lighter sets would snap at the point of impact after one heavy session). My steel string has been sitting in the closet in need of repair for a couple of years but I remember last time I went to buy acoustic strings I had trouble getting a set of 14's in-store (neither the Guitar Center or Sam Ash had them in). 

Sort of on topic...  What about bass strings?  How many of you have tried Elixers?  Expensive, but I liked them except I sometimes use a pick and the coat tends to come off due to that.

Good question, Craig - definitely interested to hear what you guys have to say about bass strings. We bought a set of flat wound D'Addario, but I know next to nothing about bass strings.

Rain
...but I know next to nothing about bass strings.

First thing to know.  They're bigger. 
 
HTH.

Depends on what guitar of course. I mostly played Ernie Ball Slinky .010 -.046
I want to try something heavier but .011 is yet too heavy for me.
So last week I ordered some .0105 -.050 GHS boomers
D'addario also has a .0105- .048 set which I can try
Going to try these as soon as I have finished changing my pickups

 

craigb

Rain
...but I know next to nothing about bass strings.

First thing to know.  They're bigger. 
 
HTH.

......and they don't fit on my guitar.
However when I play bass I like rond wound.
I'm now playing on a set (can't remember the brand) that has relatively thicker D-and G-strings.
 
 

I use Flat Wound bass strings. They last a couple years.
 
I avoid all the plastic coated stuff on my strings, although I enjoy gore coated fabrics very much.
 
Diadaro makes good strings.
 
A few companies actually make bad strings... I forget who they are... when you shop for flat wounds you sort of automatically get past the bare minimum quality threshold because drawing the string through the die to flatten it requires that it is a good string to start with. I haven't thought much about brand in a while... I just think about specific string packs that are available and the guitar/bass I use them on.
 
 
I grew up playing this set after I had started Boomer Thick n Thins for a while:
 

 
I enjoy these by adding a plain "10" and creating a set of 10-42 flat wounds:
 

 
Using these on my wife's bass:
 

 
I probably have 110s of the same on the full size P bass.
 
 
I like these compressed round wounds in the 6 string package:
 

 
compared to the same 10-42 gauge in "flat wound" they seem more bouncy and lively and you can get some string effects with your fingers.
 
 
I usually buy strings sets in a 10 pack so what ever I choose I end up getting to know fairly well.
 
 
 
I like babbling about guitars.
:-)