There's nothing like that here. The ones you mention can have issues reported to, but don't have a searchable register of reports. They only issue specific announcements when they feel an issue warrants it.

As for the car companies the local majors are Hertz, Avis, Budget and one you've left out - Thrifty (which also tends to be cheaper). Europcar and Alamo have less of a presence here so that is probably why they are cheaper - less convenience/appeal. If you find a package you like and the location/terms suit that's probably your best indicator amongst that group though; there's no particular reason against any aside from what you see in pricing, location convenience and terms.