Having used all three on an LG C2 OLED, here is my comparison:\n\n**Smart IPTV**: Most reliable for stability. MAC address activation is a bit old-fashioned but once set up it is rock solid. Good channel loading speed. EPG is functional but not as rich as TiviMate.\n\n**SS IPTV**: Available in the LG Content Store without any activation fee. Interface is dated but it works. Good for backup use. Stability is decent but not as consistent as Smart IPTV in my experience.\n\n**GSE Smart IPTV**: More modern interface, better EPG display. Available via the LG store. Slightly more setup complexity but better day-to-day usability once configured.