The best way to compare is to take a trial. For real time data, you will need to pay exchange fees, but it is worth it to compare reliability, data speed, customer support and features.
Register for a Trial Here
You already know the level of support and reliability Qcharts provides, so you can search Elite Trader for "DTN" or "IQFeed" to get an idea of the type of support and service DTN provides it customers.
Feel free PM me directly if there are any questions I can answer for you.
