Apple/iTunes physical gift cards come in two appearances, each with a different rate on Cardtonic.
Horizontal cards:
These are the standard format, wider than they are tall, similar in shape to a typical debit or credit card. Card details are printed on the back. These have higher demand and fetch the best rate.
Vertical cards:
These are taller than they are wide, similar in shape to a strip of receipt paper standing upright. They have lower demand, which means they carry a lower rate.
Please note: This distinction applies to physical cards only. If you are trading an ecode, this does not apply.