The biggest difference is in the ERS benefit.
AAA's Basic membership provides free towing from the scene of your disablement of up to 5 miles of free towing in any direction from the disablement. If you wish to be towed to your favorite mechanic -- and he is located more than 5 miles from the breakdown -- mileage charges may be charged.
AAA's PLUS memberships provide for 100 miles of free towing in any direction from the disablement.
AAA PLUS and PREMIER members get other benefits as well, such as increased "Accident Away From Home" benefits, reduced travel agency fees and reduced priced passport and ID photos. Click here to view the differences.