Global Key = We will send you the game in the form of a Blizzard code you will then use to activate the game onto your account.
EU/NA Key = Some games are region locked. We will send you the game in the form of a Blizzard code.
Buy an Account = You will get a Blizzard account with the game you bought, You will not be able to transfer the game to your account.
World of Warcraft Prepaid is the cheapest solution if you want to renew your existing account for 60 days.The price is significantly lower than in the case of payment via credit card and it's much safer. So why wait, waste money and give up on your raiding when you can buy a Prepaid?