SharePoint 2010 vs SharePoint 2013 Site Collections

You can control which mode (2010 or 2013, or both) can be used when a user creates a site collection. The CompatibilityRange property on a web application controls the site modes available for a web application. You can view or change the settings for CompatibilityRange by using Windows PowerShell.
check the following and let me know if helpful
If you upgrade from SharePoint Server 2010 to SharePoint Server 2013, there are special considerations for My Sites. (My Sites are not available in SharePoint Foundation 2013.) Make sure that you upgrade the My Site Host site collection before you allow users to access their individual My Sites in SharePoint Server 2013. This makes sure that the server software and database changes are complete so that users can upgrade their individual My Sites successfully.
A user can upgrade his or her My Site by following the steps to upgrade a site collection later in this article, or a farm administrator can upgrade My Sites by using Windows PowerShell.
  • You cannot upgrade FAST Search Center sites to the 2013 experience. Existing FAST Search Center sites can continue to work in 2010 mode after upgrade. If you want the new functionality, you must create new enterprise Search Center sites in 2013 mode.
  • To enable users to preview Word or PowerPoint search results in a SharePoint 2013 Search Center, do each of the following:

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