Neither form is a kind of insurance. Each is a certificate your insurance company sends to the state to show that a policy with the required liability coverage is in force. On its insurance requirements page, FLHSMV describes the SR-22 as a filing that certifies bodily injury and property damage liability so a driver can meet the reinstatement requirements of the Florida Financial Responsibility Law.
That changes how you shop. The filing rides on a policy, so what you are really buying is an auto policy from a company that will also make the filing. The price is the policy's price; the filing is the proof attached to it.
If you do not own a car, say so at the start. A non-owner policy provides liability coverage when you drive a vehicle you do not own, and some companies will make a filing on one.
