I recently joined both Alamo Insiders Club and National Emerald Club. What are the differences between these two clubs? I currently have a reservation with both for a minivan for 10 days. National costs $6 more than Alamo. Is one more preferable than the other? Does my spouse also get to be added as an extra driver free of charge with National Emerald club? I used a coupon code for booking both reservations. Can I head straight to the cars or do I need to go to kisok or check in desk first? Thanks!