What is the main difference between eewb and aet tool ?

Dear all,

What is the main difference between eewb and aet? Both ways we can create fields and coming to aet is in crm 7.0 and eewb is in 6.0.when we are creating fields through eewb we should have technical knowledge but aet tool is a simple tool as a function people also can easily add the fields. I want to know is there any main difference between both these tools.

Regards,

Jemmi.