If it works you may have more opportunity (the universe of stocks is much bigger than futures).
If you're in doubt how well it performs you can try smaller lot sizes on stocks (e.g. try 200 SPY (for 1$ commission) rather than 1 E-Mini (=500 SPY) for higher commission). That way you'll get a better feel how well it works in real trading.
The main disadvantage that stands out is taxes. Tax treatment and tax reporting is very straightforward with futures, it sucks with stocks.
