Having used the Share-gate tool for over 3000+ sharepoint site collection migrations from various Sharepoint flavors to SharePoint 2013 & O365, I feel comfortable using the product as well had huge success in every migration.
Sharegate is a third-party product built to migrate everything inside of SharePoint & Office 365. Migrate entire site collections or decide what you want to move: sites, libraries, lists, workflows, Nintex workflows & forms, documents, and much more.
With Sharegate, you migrate straight to Office 365 or any SharePoint version such as 2007 to 2013, or 2010 to Office 365. Sharegate is the only recommended Nintex migration partner.
If you have any questions related to this product, please reach out to me.
Sharegate Migration product license is based on server/year license – No data cap – Unlimited migration