Megatech comes with 27, 40, or 75Mhz tx module
Magnum comes with 27, or 75Mhz tx module
Megatech comes with battery tray
Magnum comes with nicds and slow charger
FutabaUSA (greatplanes) will honor the warrentee for the Magnum version only, but will service both versions (Megatech for a fee....even under warrentee period).
thats my understanding, and thats why I got a Magnum.