I play Super Slinky strings on all my electrics. I haven't used any other strings for ages. I remember that I tried GHS Boomers, and SIT, and those cryo ones (Blue Ice or something like that?)... anyway, the others didn't make the grade. They either broke too easily (GHS), or felt odd (SIT), or didn't last very long (the Blue-somethings).
Now that I've got a MusicMan Petrucci guitar on order, it looks like I'll be playing 10's on that one (Regular Slinky), since that's the string the factory recommends.
For my acoustic I think I use Dean Markley's. I remember trying Earthwood strings once and I didn't like them for some reason. I'll have to give them another spin. Maybe they were too buzzy or something.