Quote from Thunderdog:
I don't follow ER2. From what I have read here, it seems that ER2 has more volatility, but you would do best to check for yourself. I like NQ better than ES due to smaller tick size and what I think is generally better volatility. Further, the NQ's tick size is proportionate to the larger, pit-traded contract, unlike ES's tick size which is proportionately larger. Therefore, I think that ES traders may be at a relative disadvantage to pit traders who can arb ES and SP in a way that pit traders cannot arb ND and NQ. Of course, this is all over my head. I just know that I don't like giving someone any more of an upper hand than necessary.