I think it's best to get what you can here, but at the same time take it with a grain of salt and play both of them until you can decide which one plays better for YOU.
I think the Korg styles are far more alive sounding than Yamaha's, and I'm split down the middle on the individual voices, with maybe a slight edge to the PSR's, but the PA series has a huge edge in editing power if it matters to you. Really, my point here is that styles and sounds are way too subjective to get an accurate picture of what is best for you, without trying them for yourself.
I only need one arranger ( if I need one at all ) so I kept my Korg PA80 and sold off my Yamaha stuff. When it came down to it, the biggest reason for me is that I very much dislike ( what I feel to be ) the soft and unresponsive key feel of any of the PSR series boards. I think only my 40 year old Magnus 2 octave chord organ rivals it for key feel. For other players, this may not matter as much if at all.
[This message has been edited by Bluezplayer (edited 04-12-2005).]