I consider myself quite anti-sky for quite a few reasons , but I am not going to go into that I will just state some facts.
1) Sky's Broadband is ADSL which is quite inferior to cable broadband, you may be paying for 20Mb broadband but I will be truly amazed if you even get 66% of that unless you live next door to the phone exchange.
By comparison my virgin BB has ALWAYS been at least 90% of the speed I pay for, I currently have 50Mb and couldn't be happier with my genuine 45Mb plus speeds
2) Sky have almost no hope of bringing BBC iplayer or 4 On Demand to their system, with Virgin this already runs along side the many other channel specific on demand services they have, and is excellent
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I don't know how the speeds of the internet work but I can tell you I had virgin BB for 3 years and when I downloaded lost and 24 it downloaded at about 100 to 150kb and now that I have o2 internet they download a hell of a lot quicker at 600 to 650kb, so no more virgin net for me.