I am not really sure what do you need.You are comparing arrangers with voice processors.Totally two different things.

If you only need something for vocal than I would tell you to get voicelive2.It is much better than the one on pa3x.
I had it for years and it's a great unit.I think every singer should have one and learn how to use it.
It's pretty easy to use,but you do have to know some things how everything works.It has great effects plus compression.

Voicelive touch 1 or two is good to,but you can't edit many things.It all depends how deep you want to go into editing.

VL2 I was using chordal mode,but also scale mode too..I think it works best in scale mode.I prefer it to chordal mode.

There is also voicelive rack which is the same as VL2 but in rack.

If you don't want to do any editing then voiceplay is your best choice.