Windows 8 difference?

I am building a new budget pc for gaming and i want to get windows 8.1 then maybe upgrade to windows 10 later on in the year.

Is there a difference between these tow other than price ? (sorry if its noobish question i'm new to pc building and gaming)

£82.95 http://www.amazon.co.uk/Microsoft-Windows-8-1-Full-Version/dp/B00FRAE7MU/ref=sr_1_1?ie=UTF8&qid=1424434591&sr=8-1&keywords=windows+8.1 

£74.43 http://www.ebuyer.com/581064-windows-8-1-64-bit-dvd-oem-wn7-00614 

The cheap one is a OEM license which as far as i know is the same as the retail version once it is installed. However the OEM can not be used to upgrade an existing OS and is locked to the hardware you first install it on. I am not sure if you can upgrade from 8.1 OEM to 10 either.

Julin is correct. If the price is similar enough, then just get the full retail. You can install it as many times as you want on a single machine regardless if you change parts.. and there is a gray area about one other machine in the household… Correct me if I am wrong but you can install it onto two machines in the same house hold…? Such as a desktop and a laptop, or two desktops…

The terms of service have varied and I have heard different things over the years from official and unofficial sources. You will need to look it up if you are worried about it.

Anyway, I hope this helps.