Pension = savings
If you are disciplined enough to manage your own savings pot fine, if not get a pension
If your employer puts money in, get a pension, it's free money (mine puts in 10%)
Bear in mind that the Pension act 2007 introduced the "National Pension Savings Scheme" to replace the old SERPS, As far as I know this is an auto enrolment scheme for every employed person, where you will have to pay into either an accredited scheme, or into the government one. Most (all) employer schemes will be accredited. Who do you trust with your money the least? The government or a hedge fund manager?
Google it, as my details are a bit hazey from a presentation last year – blah blah blah government scheme, blah blah blah our scheme already accredited, blah blah blah – you get the picture