I've had a couple of different insurers on the toys, but switched to Hagerty some years back.
Ran a shop a few years ago where we repaired/restored classic vehicles, and Hagerty was great to deal with.
They're also invested in the hobby.
Switched a few of my later-model limited-use vehicles over to them, too.
Rather than look for the cheapest rate, look for best service and best fit for your vehicle(s) and how you use them.
All will require proper garaging & non-daily-driver use.