I compared numerous financial institutions such as banks, online fintech banks and financial conglomerates and compared the total number of BBB complaint over a three year period to the total assets of the bank. Those that have a higher number of complaints per asset dollar are likely to be more problematic for end users. Those with a lower number of complaints per asset dollar are likely to be less problematic for customers.
One thing I noticed is that student loan companies and credit card companies have a higher complaint percentage. Another thing I noticed is that most fintech banking startups have a higher complaint ratio than even credit card companies and student loan companies. They have the highest complaint ratios with a few exceptions.