I use both, and I like them. I run them through my Xbox into the TV and I rarely experience buffering times ( and when there is it's usually comparable to Blu-ray load times), although I do have Virgin fibre-optic. On the whole Netflix is better for TV shows and Lovefilm is better for movies. Indeed as well as the smaller selection the picture quality of TV shows on Lovefilm isn't that great. I subscribe to a US proxy server service which allows me to watch the US Netflix content as well, so I a great selection of stuff, and each service costs me the equivalent of 4 Blurays a year (I have DVD/Bluray rental with Lovefilm as well).
