Depends, really. 

For the fund I implemented a market neutral strategy we built.  It's entirely autonomous and dynamic utilizing a computer learning library. 

I also make a few discretionary trades on the side for my friends for fun.  No AI, just what I used to do as an oil trader back in the day.  For that it's all order flow.   Tape never lies. 

I don't like candlesticks, I don't look at MA's or oscillators, and I can never get two people who use fibs to agree on levels so I don't use those either. 

Just orderflow.  Once you get used to it, that's all you'll need.