I fly both : Helo first and after 30 years in rotor powered i begin to fly the Gyro...rotor auto rotate since 15 years
The most funny is about landing in autorotation with helicopter versus Gyro : . That'is exactly what you do in Gyro : maintain the speed, check your plan of descent, flare just before touch down...No fear about autorotation.
If you fly the Gyro, you fly the Helo EXCEPT for the hovering . That's need more or less time to learn depend the student, the Helo and the instructor...
About the cost : Take care, some ( most of them )"Ultralight" have the price of "certified helicopter" for purchase AND maintain....
Enjoy !