Well, if this was any version of Windows we were talking about except for 10, I would say yes. But they have never given away a version of Windows before. There are also rumors about them possibly wanting to charge us by subscription for Windows, so something like a monthly or annual feel to keep using it, and I have absolutely no interest in that. As far as I am concerned, I could run Windows 8.1 for the next 5 years and still be happy.
So I do not know if there is going to be any reason to buy anything except the OEM version. Or if the rules stay they same for the none OEM versions. We should know within a month though. Maybe sooner.
If you need to buy Windows 10 in the next week, make a decision on your own on if saving $20 is worth possibly needing to buy another copy of Windows when you buy your next motherboard. If saving that $20 is worth it to you, buy the Home OEM version. If it is not worth it, buy the non-OEM version.