the main advantage is that it is an income for life. If you have a pot of money and continue with some sort of draw down stucture then it could run out. Annuty rates for 75 are as good as they are going to get so I'd say if you have a sizable pot then it's not a bad option.
Unless you have a very large pension pot it probably still remains the best way of getting pension income. Even with drawdown pensions the government were going to put a cap on the amount that can be drawn each year to try and prevent people running out of retirement funds. There was meant to be a level at which the cap would be removed but it would mean that there were enough funds in the pot to prevent that happening.