"Be sure you know exactly what Autoeurope's quote includes"
That's good advice for the quotes you receive on any of the individual rental company websites, and is frankly why we switched to AutoEurope in the first place. Trying to determine what was included, particularly regarding the matter of insurance, got to be such a frustrating hassle that I finally gave up on it, followed the advice of other posters here to look at AutoEurope, and have never looked back. They're the only ones we've found that explain clearly in their quotes what's covered, what isn't, and what the cost tradeoffs will be. Trying to get an apples to apples comparison of the total cost of a rental on individual company websites, especially in places specifically excluded from CC insurance coverage, requires doing a deep dive into the fine print of their contracts which even then can be confusing.
I always cross-check the quotes I receive on AAA, Costco, USAA , and elsewhere and have never gotten a better deal on the total cost of a rental car that I do thru AutoEurope.