Use minFraud Score to get the bottom line; the transaction risk assessment of the riskScore and IP address risk as expressed in the IP Risk Score.
Use minFraud Insights when you need a broad range of data points to help assess risk.
Use minFraud Factors to learn more about how the riskScore was derived. Note that the Factors service requires additional permissions and is only available at an enterprise level.
You can find a more detailed comparison of the minFraud services here.