The single biggest advantage to Windows 10 is directx 12 which is from windows 10 onwards. So if your not a gamer there is no real point in upgrading.

However I will point out that the free upgrade is good for 12 months only, after that you will have to pay. So smart money is on doing the upgrade and login using your M$ details so that the motherboard can be linked to your account as the upgrade is tied directly to your board as in if you change your board then no free copy. After that just roll back to your previous os. But because your hardware is now linked to the install you can do a fresh install of 10 whenever you want and it will cost you nothing.