Just my two cents on eSignal and DTN IQFeed,
eSignal is a great data feed that has a lot of tick data for tick level data analysis. That is something you cannot find from most of the other cheaper data feeds. Its charting software may have problems due to frequent releases with new features - but thats the issue with the charting software, not the data it offers.
IQFeed is a more economical data feed solution that works great with what it has to offer. Many programmers like to develop their own trading tools. IQFeed offers a balanced API for personal usage with enough data to satisfy the need of many traders.
So as oppose to think in terms of which data feed is better - think of what you need and what you can afford and start from there.
Before internet data feeds become the norm, most data feeds available at the time is much more expensive than what most of you have seen. We are talking about 300 to 500 dollars a month easy, and that is 56K or less through cable, satellite, or direct data ground line.
All data feeds have their own problems, the important thing to consider is how you are going to deal with these problems.
e.g. If your trading strategies based on 10-minute time frame, then a short outage with the data feed is not such a big deal and you are likely happy with any reasonably functional data feed.
eSignal is a great data feed that has a lot of tick data for tick level data analysis. That is something you cannot find from most of the other cheaper data feeds. Its charting software may have problems due to frequent releases with new features - but thats the issue with the charting software, not the data it offers.
IQFeed is a more economical data feed solution that works great with what it has to offer. Many programmers like to develop their own trading tools. IQFeed offers a balanced API for personal usage with enough data to satisfy the need of many traders.
So as oppose to think in terms of which data feed is better - think of what you need and what you can afford and start from there.
Before internet data feeds become the norm, most data feeds available at the time is much more expensive than what most of you have seen. We are talking about 300 to 500 dollars a month easy, and that is 56K or less through cable, satellite, or direct data ground line.
All data feeds have their own problems, the important thing to consider is how you are going to deal with these problems.
e.g. If your trading strategies based on 10-minute time frame, then a short outage with the data feed is not such a big deal and you are likely happy with any reasonably functional data feed.