I have been getting a lot of questions about this lately. This is the best explanation I have seen. Vantage score seems more heavily weighted on available credit.

Vantage Score vs. FICO score

The VantageScore is based on six variables, versus the FICO score’s five variables. Here’s a comparison of the two:

Vantage score

Payment history
32%
Utilization
23%
Balances
15%
Depth of credit
13%
Recent credit
10%
Available credit
7%

Total
100%

FICO score

Payment history
35%
Length of credit history
15%
Amounts owed
30%
Types of credit uses
10%
New credit
10%

Total
100%