No brainer for me since ADSL is slow in my area (middle of a city no less), about 3-4Mb tops, when a company can do FTTC for you and offer 50mbit and soon 100mbit which performes exceedingly well (for me) then there's simply no choice.
Some areas are said to be oversubscribed and so peoples speeds aren't as good but I swear i still get massive throughput from my connection, speed tests run flat out at 50mbit and large sustained downloads run at 5MB/sec at almsot all times of the day.
I could just be lucky