Mambo is "community, gallery and tons of extensions" that is designed to run small to medium websites on "cheap" webspace. eZ Publish on the other hand is "enterprise stuff" that is designed to run large sites on one or more servers.
But don't be afraid, there are fairly affordable solutions to run eZ Publish sites - as long as you don't serve thousands of requests per hour.
My current hoster charges me US$ 5 per Month for 12 gigs of webspace and 500 gigs of traffic - I even got a ready-to-run setup preinstalled on my account. Debug prints for the demo-plain site with all features enabled total processing times between 0.2-0,7 secs (cached) and 4-10 secs (all caches empty), which is fast enough for small sites.
Dedicated servers aren't that expensive to run (at least in Germany). For example you can get a real root-server for 15¤-29¤/month (single CPU machines). On these machines you'll have definetively more speed than on any shared webspace.
Thank you very much your reply is really encouraging,
but do you think htat for none enterprise projects, it is better not to use eZ??
any way, please, if you have time join me on abo_moussa79@yahoo.com, or abo_moses@hotmail.com , it is a problem to be the only user of eZ in my country :(
At the moment I've got to prepare for my university-exams, so no time to spare.
To answer your question: If you want to quickly build a site with standard features and many limitations regarding customizing the design you can head for Mambo. But you should take eZ Publish if you want to have a site exactly the way you want. It requires a little more work, but eZ Publish has much more possibilities than other cm-systems.