Customers have given Metro Bank a ray of sunshine as the competitive business surpasses official satisfaction ratings.
Metro was first with First Direct. 82% of UK retail customers said they would recommend the banks to their family and friends.
Metro has been plummeting in recent months and is looking for a new chairman.
RBS remained last in the twice-yearly customer list.
The survey was the result of claims by the UK Competition Authority to encourage change and competition in customer service. Banks must prominently display the results in stores, on websites and in apps.
In Northern Ireland, HSBC was at the top of private clients with a 77% satisfaction rate.
In July, Metro Bank reported a sharp decline in profits in the first half of the year following a serious accounting error that shook confidence in the bank earlier this year.
After customers withdrew £ 2 billion in deposits during the six months to June, the company announced that its founder, Vernon Hill, would be replaced as Chairman.
In the survey of almost 4,000 people Metro was according to British bank customers with First Direct at the top of the overall service quality.
"Service and convenience are central to everything we do at Metro Bank, and we're thrilled that our customers can see that," said Craig Donaldson, managing director.
Nearly 17,000 small businesses were also surveyed on customer service at banks, resulting in a ranking of 14 banks.
The Swedish Import Trade Bank again took first place with a satisfaction rating of 85%.
TSB, which was still suffering from an IT fiasco last year, was at the bottom of the list.
In Northern Ireland, Santander topped the list with a satisfaction rate of 65%.