It is often more important to choose a good loan officer, not the institution. Loan officers have two jobs. One is to be your advocate in getting the loan approved. The other is to deliver quality loans. You want someone who has proven dependable and ethical in the past -- someone you can trust.
As for lending institutions, each type of lender has strengths and weaknesses. Quality within each branch or office can vary, depending on the loan officer, the support staff, and a variety of other factors.