I do have XBOX Live

Get Assassins creed brother hood, there are many objectives you can do like on FO3, but the down side to it is that you cant kill civilians which sucks... if you know what i mean. but over all the gameplay is awesome especially the leonardo invention missions... which i enjoyed the most. with FO3 you will find that you spend most of the time looking through stuff leaving no stone unturned to find extra ammo, stimpacks, and other stuff... this will get very annoying, and considering that the world map is sooo massive, that is a lot of time you r gonna waste. i also found that the combat was also not the best...
btw, having xbox live doesnt change anything, if you try multiplayer ACB you wont find a single match... so get assassins creed brotherhood.