Depends on your flavour of normal.
Where there are complex curves, especially when machining metal, 5 axis CNC is most advantageous but for guitars, being relatively shallow in depth, complex shapes can be achieved easily on the more affordable 3 axis machines.
You need an aptitude for programming them though, even with the so-called intuitive models. I suspect that I am not the only one to have issues with that aspect of the equipment.
For those wanting to know the difference between 3 and 5 axis CNC.
Yes. Me too. Heeheehee