Disadvantages of Waves Tune
You have to let it manually scan everything
No time correction
Can’t see anything past 10:00 on your song, and if says "outside session limits"
Can not quantize to nearest note
Limited formant control
No reason for Cubase users to buy - Cubase stock autotune is much better
Advantages of Waves Tune vs Melodyne
Better than the autotune in Logic by far
Pencil tool can manually re-draw waveforms. Melodyne can not.
Far cheaper than Melodyne
Works as an AudioSuite plugin in PT.
Note: How ‘natural’ or ‘unnatural’ an autotune sounds is largely about how good you are at using it. These are not plug and play devices, and it takes some practice to get proficient with them.