A trade is like going to cinema. You pay your ticket fee and want to get something in return. If you visit the cinema, it is entertainment, if you enter a trade it is opportunity to achieve a profit - although many traders seem to pay the fee just for being entertained. Opportunity to achieve returns is linked to volatility. A volatile instrument helps you to achieve higher returns - positive or negative.
The idea is to keep trading costs low. Therefore you want to pay little in terms of commissions and slippage and benefit from higher volatility. There is a separate thread on that subject here:
When comparing ZB and ZN, the higher volatility speaks in favor of ZB, while the lower trading cost (lower spread and slippage) speaks for ZN. So I do not see much of a difference between the two instruments, also see attachement to the post as per link below:
Regarding TT Autospreader... x_trader pro will certainly cut down you development time but scalping intraday may be out of the question. In high liquidity spreads markets like STIRs and bonds, it will be difficult for a small trader to get fills because of lack of volatility and time pro rata matching algorithm that favors large orders. In more volatile spread markets (grains, energies) you can, and likely will get hung on your hedge order because HF Traders know exactly where autospreaders are working and will take advantage of that because they are just faster. Co-location won't be much help here if they know what you are doing.
Exchange-based spreads are good where available but you may need to pull out to a longer timeframe.
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