I do all kinds of demos on Tyros and PSR, and most often I am presented with instruments just taken out of the box only minutes before my clinic.
It is nice to have an instrument that sounds great right away, and, that's just how the PSR's and Tyros's sound...great right out of the box.
They can easily be made (adjusted) to sound different, and the amount will depend on the personal taste of the end user. Some people are quite content with the factory settings, and some are more adventurous and like to experiment, but the settings used by some may or may not agree with those another likes to use. Sound is personal.
Yamaha's arrangers have an inherent characteristic sound...so do Korg's and Roland's, so it's pretty darn easy for someone to find the best platform to start with for the basic type of sound they want to hear coming from their speakers.
So, start with the right brand of instrument, and don't expect your new Korg to sound like your last Roland, or your Yamaha to sound like your recently sold Korg....the hearts of these instruments are different, and deliberately so.
Saying one is "better" than the other is simply telling everyone else what kind of sound YOU happen to like...nothing more.
Today's arrangers are all terrific sounding instruments, and, we are lucky to have such fine choices available.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.