Differences

[Ryaca]

I've been considering playing the offline game when I am somewhere where I cannot connect to the internet. Can anybody tell me the major differences between the offline game and the online game? Like what are some major dealbreaker things that you can do online but not in the offline version? I know there are a few hardcore gamers that talk about playing both versions and I would appreciate your feedback very much. Just for those rare times when I don't get coverage in a certain area or am visiting relatives or friends that just so happen to live out in the middle of nowhere.