If it is anything like here in the United States there is no real difference between the two from a consumer perspective (except at most whether your bank issues Visa or Mastercard as a debit card, although Visa debit is the most common).
When it comes to using them abroad they both act the same. As long as there is a Visa logo (if you've chosen Visa/Visa Electron) or a Mastercard logo you'll get the same ability to use the card as if it were a native issued card.
So you should be able to focus your choice on the issuing bank and how well either method would work in your country.