Multiplex (MPX) 3030 35MHZ , never had problems loosing control with MPX
2.4GHZ has it good thing , but due to the short wave certainly more vulnerable to all kinds of the reception distorsion, as even trees can distort reception

Anyway, 2.4 GHZ is not to thrust in Europe ( this frequency is shared with all kinds of stuff )

Some producents are marketing it, but advicing against it

For classic pattern, you only need a simple set, strating 4 channel up to 7 ( adding retracts, mixture controls , flaps , ....) That's how the guys did it in that era !

Steven