After years of rentals, I've really only ever had consistently good experiences from National/Enterprise.

I vowed off Hertz 6 years ago. It was around midnight after a long flight, my phone was dead and I had a rental booked from another company.

I was thrilled to see that the Hertz rental counter had a large box of car chargers with a label "$8.99" or something reasonable. So I walk up and ask to please buy one.

The person behind the counter looks at me in disbelief "No, these are for customers only. We're not a convenience store. Go find a Seven Eleven if you need a car charger."

Six years and $10,000+ in business rentals later, I've still never rented Hertz again. Customer service matters.