Pretty much unless there is something specific you need from 8.1(and even then you can probably get it trough 3rd party aplications) get Win10.
It's MUCH better in my opinion.
Windows 7 Pro / 8 pro will upgrade free to Windows 10 Pro
Windows 10 Home will not upgrade to Windows 10 Pro.
Pro is mainly for business, like advanced security features and more network options, like joining a domain.
Unless you need these features, I´d go with Home version, as its easier to install Windows 10, than installing windows 8 and upgrading to 10.