I live in downtown Toronto and don't own a car. I use car sharing for local needs, but the traditional car rental companies for when I need to leave the city. Enterprise has been consistently terrible. On multiple occasions I've had to wait hours past my scheduled pick-up time due to either understaffing, overbooking, and/or due to other events. Enterprise apparently has a deal with insurance companies where they loan cars after accidents. I once had to wait 12 hours for a car as they were over-booked due to accidents after a snow storm. One time I was rear-ended in an enterprise-rented car. The other person's insurance dealt with the damages, but 18 months later they called me up, demanding payment for the time the car was in the shop.
I used to rent from national/alamo as they would rent to me w/o mandatory extra insurance when I was under 25. They were bought out by enterprise and almost immediately went downhill.
Hertz has always had a car available when promised. I can also take the rentals across the border to the US w/o extra fees. Twice they had to upsize my car for whatever reasons and they gave me a discount to deal with the greater fuel consumption.
As somebody who is a loyal Hertz customer, I worry what the company will look like after the bankruptcy.