how to compare ATT Plans

The ATT chat representative said that he works for another company hired by ATT and that he does not think that ATT has information on the net where a proposed new customer can compare the prices and services offered in its various plans.

So he says the only way to try to get that information is to visit this Forum.

If ATT has a link where I can compare its plans side by side (or apples to apples) I would appreciate it if it would post the link here.