I think YM and NQ are a bit more dangerous if position trading than ES due to the way the indices are constructed. Both YM and NQ can be influenced by movement in one or two stocks, the ES less so.
I tend to stick with ES, probably more due to inertia than any real analysis. I am under the impression that they tend to move pretty much in lock step during the day, but ES has far more liquidity.
I tend to stick with ES, probably more due to inertia than any real analysis. I am under the impression that they tend to move pretty much in lock step during the day, but ES has far more liquidity.