Reply to iTunes Radio vs Pandora vs Spotify vs Rdio vs Google Music, etc etc

Hey guys,

So right now, I'm paying for iTunes Radio (because I use iTunes Match) and Pandora. I'm believeing of dropping Pandora and testing out one of the others. What are your thoughts on these services for general listening as well as music discovery?

As a general music listener, I'm sure most of them will suffice. But as I DJ house music (deep, tech, funky), any of you househeads have a personal favorite for finding new tunes? Or any other music services I should check out?