If that pertains to you, for work rentals, you probably don't have a choice but to use Hertz. For leisure rentals, however, if I were in your shoes, I wouldn't reward Hertz with my personal money. I would only rent from them when their prices are significantly cheaper.

There's another similar thread in the Avis section, if I recall, about how Avis points have very little value to the end consumer, but many big corporations insist on using Avis for very good rebates. So, when those people have a choice, for personal travel they almost always use National. But then also if I remember correctly, there was a National thread where people were surprised to not get rental credits. An exit booth agent said a message came up attached to their company contract ID saying "Emerald Club not supported."