I prefer to use the keyboard on-board effects.
Yamaha is particularly strong in this area.
The PSR2000 allows you to select, edit and store reverb, delay and compressor/limiter settings.
It is also easy to adjust "on the fly" because different venues often demand different effects.
I find the quality quite good. I also have external effects units, but they are currently not in use.
The audience wants to be able to hear clear, distinct vocals. I generally use a combination of a little reverb and a little delay (just one repeat, quite a bit reduced in volume from the original vocal signal).
In really live rooms, the delay is not used at all, and often the reverb is reduced.
The Talk setting on the PSR2000 (and 9000) is easily set up for an alternate vocal setting.
DonM
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DonM