Trading with technical indicators or using order flow ?

Let's start directly with an answer : not automatically.
Every thing depends on the sense you are attributing to your indicators and to the ability of your indicators to predict future movements. Trading is all about prediction so that is the task we have to complete !

The trap you should avoid in trading is to consider what others are saying. Having your own opinion is very important and this is probably what will allow you to profit from the markets !
Of course you can listen to what the other traders are saying but don't automatically change your trading style because someone told you so. 
So what I am going to say is only my opinion and you should make your own one.

I think that order flow is a crucial market's information. Indeed, buying and selling orders are making the market to move up and down ! But it can be used for short term trading, I think that for longer term trading, order flow is useless but can appear under different forms such as Market Profile, Volume Profile or Volume.

Order Flow and automated trading

Order flow is big and fast data which means that a human will have some difficulties to be very regular analyzing it. But it is possible. However, computers and trading algorithms are better at this task than us. So if you are looking for an automated strategy, you should use the computer's advantage to analyze order flow data.

Finaly, it depends on your trading style and on your personality. Order flow can be hard to be understood. That is why you should use what you are at ease with and keep learning.