I would not know a magnetron from a klystron, from a hole in the ground.
But you might???
An opinion?
Magnetrons are a tube type device with strong magnets. Creates the fundamental frequency. Used to create high peak power in pulses. Radar used to use them before solid state arrays with many modules became most new designs. Microwave ovens also use them. Designed to produce a particular frequency.
Klystrons are tube type amplifiers which can be used for high power transmitters like radio stations. Used to boost another signal to the desired level.
Both invented before WWII. Another potentially high power amplifier is the TWT or traveling wave tube.