A few day ago someone asked me what SharePoint version she has to install? That’s a difficult question. You can check the comparison charts on the Microsoft website but you also need to define what you want to do with it.
- Do you need a document management solution?
- Do you want a collaboration tool?
- Do you want a search engine so that you business data can be found?
- Do you want to have a application platform?
Based on those questions you can select the edition you need.