What works best when market isn't trending?
Maybe this?
From what I've read (so, bear in mind you are getting theory here, not my own experience!) Firebird seems to prefer choppy sideways markets.
https://www.mql5.com/en/forum/173367
Jump in on the thread, there is a TON of info...
I'd be interested to know what else you find. 
good luck!
-cubesteak 
I have one friend that uses the stochastic and the cci together when markets are basically flatlining. I'm am thinking that is redundant, they look at the same basic stuff. I was told the zig zag looks at something different.
Question basically is when the markets are not really established in a trend or 'between' trending one way or the other what is the most winning strategy? most winning indicator combinations etc.