M3U or MAG: what's the difference and which one to pick?

An M3U line is a link containing a username and a password. It works on almost anything: Smart TV, phone, computer, Firestick, Android box.

A MAG line is tied to the MAC address of a physical set-top box (MAG, Formuler, some decoders). Nothing to type in: the portal loads by itself at start-up.

Pick M3U if you watch on several devices, and MAG if you have a dedicated box in the living room.

In both cases one subscription equals one stream at a time. To watch on two televisions simultaneously you need two lines.