[Xyrael]

The games aren't the same, you'd definetly need two seperate accounts, since the content in the games beyond certain shared battlegrounds are completely different. The 360 version is set 50 years later, so a character on the PC version would likely never be played on the 360, and vice versa. Granted, you might only have to purchase a single account and have both 360 and PC characters on it, but that's unfair for payment plans. The 360 players would be paying more than PC when taking the relatively tiny payments required to play an xbox online. It'd also probably be a bit confusing on character selection. I imagine a lot of people who don't want to play on two accounts are going to have to decide which version they want.