I have reestablished credit over the last couple years
For mortgages FICO is what determines your interest rate, especially for conforming loans, but you still have to provide tax returns, income, and expense or bank records for the initial underwriting. The reason is that conforming loans are typically guaranteed and securitized. Once the loan is done your FICO is tracked together with that of other loans in the portfolio and they no longer have access to your other details. FICO scores are how they value the portfolio over time.
There is a huge amount of historical value agencies have relative to FICO scores so it is extremely difficult, bordering on impossible, to use other scores. This is the main reason Fair Isaac is so dominant and it's unlikely to change.
myFICO is the consumer division of FICO. Since its introduction 20 years ago, the FICO® Score has become a global standard for measuring credit risk in the banking, mortgage, credit card, auto and retail industries. 90 of the top 100 largest U.S. financial institutions use the FICO Score to make consumer credit decisions.
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