Netflix has an immensely larger library!
Just install stealthy to either chrome or Firefox.
You can then use the UK/US/Canada Netflix libraries at the flick of a button
Watched 3 seasonsof a TV show on the UK one them switched to the US one for the next 2 seasons
Steraming quality on lovefilm I found quite pants tbh, even using the US and Canadian Netflix ones seems instantly noticeably better. Full HD and 5.1 available also.
theres also a quick DNS change you can make on your Xbox or PS3 in order to access the US ones without having to do anything else