For the home user, HP is plenty. Pro gives you XP Mode (easily replaced with VirtualBox and an old copy of XP), ability to join domains (not required for home PCs) and backup to networks. See the article to replicate some of those features if needed; click here
Compare versions; click here
Yes, Office 2007 works with W7.
Windows 10 Home vs Windows 10 Pro comparison: Here are the extra features you get in the Pro version