As far as the functionality goes, there is no difference between the two. However, there is a difference in the way you register the Air SIM.
Air SIM from Amazon
For Air SIM purchased through Amazon, you need to register 1 by 1 in our User Console.
Air SIM from our User Console
when you accept your order in User Console, all the Air SIMs under the same order will be registered automatically.
If you plan to purchase large number of SIMs, using our User Console will save SIM registration time.