Lovefilm charge for the latest releases (on their "unlimited streaming only option but we like to pretend it is unlimited when it's not really" for £5 a month), not all of the latest releases are available for streaming either and you may have to wait for the DVD/BR to come through the post if you go for the most expensive package that includes streaming and discs.
Netflix don't have the latest releases, even at additional cost like Lovefilm and in the UK they don't have the postal disc service and won't be having it either as they want out of that game completely.
Sign up for the free trials they have and see which you prefer is the only sensible option here. I'll be waiting for the content to get better before paying for either service.