Which policy would provide the broadest coverage for personal property?

An all risk policy provides the broadest coverage for personal property because it covers loss or damage to property caused by any peril that is not specifically excluded in the policy. This contrasts with a named perils policy, which only covers specific risks that are explicitly listed. The special form policy also offers a broader range of protection than basic forms but still includes specific exclusions, making it less comprehensive than an all risk approach.

In the context of this question, the all risk policy's ability to cover a wide array of potential incidents while offering flexibility in terms of what is included (unless explicitly stated otherwise) makes it the best choice for someone looking for maximum protection of personal property. The distinction here lies in the overarching characteristic of an all risk policy, which essentially serves to safeguard against unexpected events, providing peace of mind that is valuable to policyholders.