There's really no one best home and auto insurance company because you may experience different results through different auto insurance and homeowners insurance companies.
I have my homeowners insurance and auto insurance bundled through Allstate and I save some money by having both homeowners insurance and auto insurance bundled together and get a discount because of it.
I would recommend Allstate Insurance for Homeowners and Auto Insurance and in my opinion they're the best.
Geico Insurance, Progressive Insurance and State Farm Insurance are all good insurance companies as well and are high rated insurance companies.