Showing some similarities from SPY and the S&P 5-min charts.
They move mostly at the same time.
Trading them both especially in the e-mini (ES) can give you an edge rather than trading individual stocks.
Notice the previous last hour of trading and the first few hours into the open, it's a seesaw battle.
But after some selling and buying pressure, it settles down and started consolidating.
That's where the best location to enter a trade.
The advantage of trading the e-minis as compared to individual stocks is the absence of market maker (the middleman) that sets the price.
In the futures, there's no problem filling the order, it can buy/sell the price at the market with no marked-up.
And the execution is right on real time.