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The question is not one of how accurate a score is. All scores are accurate for the mathematical models upon which they are based. Rather, the question is what score is your prospective lendor going to look at? Most look at FICO. That does not make FICO scores any more accurate, it just makes them more useful, and who needs a credit score that is not useful for its purpose?
Aside from the fact that most lendors use FICO scores, another reason to look only at your FICO scores is to have a uniform basis for monhthly comparison of progress. FICO and non-FICO scores cannot be correlelated or compared, and thus looking at both will surely confuse, and not help!