Is it better to get a bank's auto loan or go directly to a dealer?

Hi I am thinking about trading in my car. I was wondering which would be cheaper... Current apr for buying cars (or atleast with my credit is 7.99% apr) on a $22000. I still owe $8800 on the one I currently have. The current apr on auto loans is around 4.30%. Which one is a better choice? Should I get an auto loan to buy a car and do trade in or just go to a dealer, trade in, and let them do the financing?