- ATL3 is free script, ePower is paid ;)
- ATL3 is script written in C, meaning more stable and can handle more traffic without problems. Epower is a PHP script and aslo is stable, but not that fast when it comes to big traffic ;)
- epower has better cheating mechanism and can detect and disable cheaters pretty effective, on the other side atl has also good mechanism, but not that good as epower....
etc, etc
Anyway, if you don't want to pay for script go for atl, if you want buy epower or swiftclicks (
www.jbscripts.com) which is imo the best trade script on the market with the most sophisticated algorithm.
Just my 2 cents; )