They all offer comparable claim service, and they all have similar requirements (must have another vehicle, collector vehicle must be kept in a locked garage, etc). The differences you will encounter are with rates, and with activities excluded from coverage. Get quotes from multiple carriers and ask them for a list of coverage exclusions. That's the only way for sure you'll know if you're getting what you need, and for a price you're willing to pay. Rates for anyone else have nothing to do with rates you'll be quoted, so ignore anyone who says "XYZ is the cheapest."