Continue design study
mamalala design could be improved by simply adding pre-amp stage (as in
Sergey design) which will solve the driver overload issue and will raise output power.
Another aspect is the output transistor blow-up at the power-off time, which is a well-known phenomenon in high power RF amplifiers, that is the energy accumulated in the output filter which applies to the closed transistor and is well higher than its drain breakout voltage. In
sergey design a TVS is used which is OK at this relatively low frequency, but a better solution is simple to use a transistor with a higher breakout drain voltage.
One common technics used in industry is to taper drive oscillator signal down before switching it off, which means implementing soft power off in firmware. Here same might be done by driving down the output stage power supply.
Otherwise, two designs are equal, probable a little bit more tweak might be done by optimizing low pass filter design...