[astura]

It's not that simple; you are effectively required to use FICO if you're participating in the "normal" mortgage market due to government regulations.

From TFA:

>Even if a lender thinks the customer would be a good risk, the lender has to buy a FICO score regardless. Mortgage bankers don’t carry the capital to hold the mortgages they make. Instead they make a loan, and then send it onward to the capital markets. First, the government guarantees most mortgages through Fannie Mae and Freddie Mac as well as other programs for veterans and first time homebuyers. Then, the government in turn sends these guaranteed mortgages to Wall Street. This complex process relies on a standard to price the loans, and that standard is FICO, combined with the credit information from the three bureaus.

Doesn't matter how accurate or inaccurate it is, if you're selling to Fannie Mae or Freddie Mac (which is the majority of mortgages) you HAVE to use FICO.