Rotational stability

No.10985807 ViewReplyOriginalReport
>Blue flywheels rotate in the opposite direction of the green flywheels. The black axle itself is not spinning, but its mass is far less than the flywheels. The device is floating in outer space and under its own power.

This isn't one of those retarded puzzles or anything. Does anyone know which of these two is more stable, if they have different levels of stability? I know that there's a huge issue with longer objects rotating due to the tennis racket theorem. Regardless of how stable you want a spinning object to be there's always going to be at least 3 difference angular forces playing upon it.