We will have both the XBox360 and XBoxOne and we want to use both.
We might sign into “my” XBox Live Gold account and want to play and complete cheevos on XBox360 and then swap over to the XBoxOne and play a game and complete cheevos on it.
Do we need two separate XBox Gold Lice memberships or, can we seamlessly change between the two boxes with the one membership/account/etc?
The 360 and X-bone will share your XBL accounts. So you don’t have to create a new one, everything will transfer over and you can continue to play and sign on your 360 if you wish. It’s one of the few bright spots of the X-bone.
They said your Xbox Live membership will carry over with you to the xboxone, so I assume you can also carry it back to the 360. I don’t think you need a second account unless you plan on playing both Xboxes at the same time.
Xbox live membership will carry over to the next console.
PLus one Xbox one, one gold subscription will grant xbox live gold to all accounts on that console. 