Well, since the thread has been necro'd either way!
I prefer doing a mix of scales, and just playing. I used to play my scales pretty much all the time. At a certain point I found myself unable to play anything not in a standard pattern/up-and-down run. It was then I decided to just play randomly at a certin place on my fretboard, and listen what sounded good. I ended up with a mix of my pentatonic scale, and a few notes not normally included (nor in the blues scale). It probably is part of a scale, but this got me to use it effectively instead of purely relying on the patterns I knew.
It's not like that for everyone, but one of my weaknesses is settling too much into a routine to get out of it.