My vehicle is going into an auto-body shop and my insurance ia going to cover the rental. Choice was Hertz or Enterprise. Hertz seem to go out of their way to not promise anything and to tell me nothing is promised without any hint that they would try to do something. It was an easy choice to go to Enterprise. If this is the way they start the business relationship - in my opinion -0% chance it was going to get better once I was in their car.
First had to talk to their call center but to talk about the pickup times, vehicle selection etc - they had me call the local shop. They don't seem to be able to coordinate even between themselves.