It really depends upon which rating tier you fall into. Insurance companies file their rates with their local state insurance departments.
For example if you have a great credit score and clean driving record, then Allstate may have the best rates.
If you have some convictions and bad credit then maybe Progressive.
The insurance companies change their tier structure annually, that’s why it is always recommended to check pricing on your insurance annually.
Here is some information about Allstate Insurance Company. Allstate – Insurance Humanity