Casio CZ/ VZ/ FZ - Pro Series

Hi,

I have the opportunity to buy a used VZ-1.

I already own a Yamaha FS1R 8 op FM (that is actually PM) synth, and according to its specs the VZ-1 has many similarities: like the FS1R it does phase modulation (PM), it has 8 oscillators and for each oscillator you can chose among several waveforms.

So I'm wondering if a VZ-1 could actually do something a Yamaha 8 op (with other-than-sine waves) FM synth cannot do, or would it be redundant?

Thanks for your advice.