Agree that National has the best fleet and service. Rewards program - good if you do a lot of short inexpensive rentals. I could spend $450 for a long-weekend rental from Manhattan and get the same credit toward a free rental as a $30 one-day rental, say, off-season in Florida. Hertz is "more fair" as it's based on spend and there are various redemption options. My other problem with National is that their hours in New York City are terrible, it's like they don't really want people renting cars from them. In terms of National pricing, I usually find that not using any code gives the best rate (cheaper than using the Amex code it seems!), unless you have a good corporate discount you can use.