Okay so I answer my question, myself quickly after doing a lot of research
1) Magneto is awesome and more or less out of the box
2) CRE is buggy and needs a lot of patches to get things right
3) Zencart ,a lot of modules made for oscommerce, wont work with Zencart )
What would you choose between Magento , CRE and Zencart? Any Particular reasons ?