I have premium bonds. Depends how lucky you are but I think I read the average interest rate works out as 1.4%. Which is more than a normal saving type account.
Obviously depends on luck and how many Premium Bonds you have. You can work out how lucky you are using the Premium Bonds Calculator on MoneySavingExpert web site.
Obviously you could be unlucky but there is the added excitement that you could when £1000s each month. Over last 12 months, I won £25 in May and £75 in April! (3 x £25)! Its a bit hard to calculate how lucky and equivalent interest rate because I have had different amount of bonds at different times. I think this year been more lucky over because I won nothing in 2019, and just once in 2018 and 2017 (£25 each)