Linux mint using the Cinnamon interface is the best linux experience I have had, so I would recommend that, if anything, ubuntu is nice too but I still find the side dock strange, and mint offers a more traditional desktop experience for me, though usually I use Windows if I can afford it.
If your looking for Windows , don't forget that you can usually get cheap Windows 10 keys at /r/microsoftsoftwareswap
Unless you really want to pay so much for the Windows 10 USB (I'm so glad they finally ditched using CD's)