Consider your needs and system requirements before deciding between Win 8 and Win 10.
Consider your needs and system requirements before deciding between Win 8 and Win 10.
Consider a fresh setup after upgrading. Purchase the most affordable version of Windows 7 or 8 available, then upgrade to Windows 10.
The downside is that you'll have to go through more steps if your end goal is a clean install of Windows 10. There is no technical difference once you're done, though. 10 is 10. If it were me, and I wasn't saving much money with 8, I'd probably just wait for the 10 product key to arrive.