In Texas StFarm would only offer me a stated value policy with very restrictive driving @ about twice of what Haggerty wanted or a regular comprehensive policy for 3-4X per yr.
Let us know what yours say, some in CA seem to get good deals from SF in their state.
I talked with my insurance people this morning - It seems that much of what you experience, may depend on the individual office / agent, as much as it does anything else.
For the antique / classic coverage, State Farm looks for use for parades, shows, less than 1,500K miles per year...BUT...it seems the interpretation and application of what constitutes as a show or valid mileage, falls to the agents office. My agent told me that they are, somewhat liberal, in how the interpret the stipulations. 4000 miles per year back and forth to work, would not be ok, but if I'm creeping up on 2000 and using the car on "nice days" regardless of where I was actually going, that wouldn't pose a problem. I have a long relationship with this office, so I tend to believe what they say, and my agent didn't seem concerned at all with my sub 2000K use for most any purpose, provided its not a clear violation...i.e. If I've insured a classic truck, and it turns out I'm using it to haul aggregate for my business.
In terms of agreed value versus stated value: Stated values is what I have on my classics, and according to my folks at State Farm, its true that the stated value does not automatically get paid out in the event of a total loss - which is the same as most any other conventional policy. The stated value is really only for setting the premium, and to act as a starting point for underwriting / payout in the event of a total loss - but in all cases the office would evaluate the local market - which apparently includes forums, clubs, etc, to determine payout. None of my cars are super rare, number 2 cars, or anything where I've invested the GDP of a small African nation in restoration - so none of them are going to demand top-tier valuations for me to be adequately compensated. I confirmed underwriting performs an initial review of the stated value to make sure they are comfortable at that value, and since I know I am middle-of-the-pack in values, it doesn't seem like it would be a challenge to validate whatever value I've indicated. The actual language is something to the effect of: Legitimate value in the local market, as priced within the last 30 - 60 days, of a vehicle in similar condition and same make, model and equipment level.
In terms of "under restoration" insurance - I have my 57 Chevy insured that way, and although it is perfectly capable of running down the road, I just don't drive it that much and it has been undergoing some modifications, so State Farm has it insured for comprehensive only, no liability, so not insured for driving, but would be covered if a tree fell on it, or rodents destroyed the interior, or the shop burned up. Costs me $2/mo.
So ...to sum up..... I still have no idea which insurance is best, but it seems your insurance agent and the tenure you have with them, might make a difference.
P.S. - If I were to convert my '69 mustang to a conventional policy, but all else being the same (coverage, values, etc) it would cost me an additional $300/yr or $50/mo