It is much faster to pay for travel with an electronic ticket. You do not need to pass the card to the driver / conductor and wait for the rest.
Fare is easy. It is enough to present an electronic ticket to the validator.
The card is always in your hands. You control the payment process. Funds cannot be deducted twice for one trip. The validator processes one payment at a time, then beeps and displays information about the success of the transaction.
You independently view information on replenishments, payments, balance in the personal account.