<i>"Austin, why did you stop trading the ER2? I still find it to be more trendy than the ES although trading more than 5 to 10 cts begs for slippage"</i>
The only advantage ER had over ES for me was $$ range of swings. Today that relationship is evident, with ES in a 10pt range ($500 per contract) and ER in a 20pt ($2,000 per contract) range. The comparable distance between swings gives the ER more potential bang-fer-buck.
However, the ER tends to be spiky. It will frequently come back and whip out an otherwise perfect trade. That's the tradeoff for working a contract with higher volatility than others.
For myself, I need to enter 10 - 100 contracts and not suck in my breath every time the fill comes back. Fills on 10 - 20 ER contracts has always been an adventure, but these days can be horrible.
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As for capturing bid/ask spread, entering on extreme ticks, etc I agree the ES doesn't offer that. But, with historically normal VIX levels now rather than decades' low volatility which is dead & gone, who needs to be so pinpoint precise?
Markets are tossing around $500 per contract ES/YM swings like condoms at a frat-house keg party. Who in their right mind is trying to micro-scalp $25 blips when crystal clear $100 ~ $200 per contract swings come along oh, about twenty times per session?