Wordpress Plugins and theme data should be installed before import of xml or after?

Actually this question is based on another question on stackoverflow here Duplicate a wordpress site on new domain/subdomain

So based on above question What is the better way to do this: Plugin and Themes data (site data) should be installed/uploaded before import of xml file or after?

BTW: I think the better way is to install (it will auto create the tables) then, sql dump, Because i think sometimes if you dump first, the plugin might encounter conflict with existing table? But if you just copy the site files and then do the dump it should be linked automatic

Waiting for your answer if you know a better way to do the same?

via Chebli Mohamed