We have different opinions on which arranger is best for live playing, but that is to be expected as each of us will have different needs and preferences.'
I find the Korg the best for live performance, taking into consideration the excellent vocal processor/harmonizer, the Songbook, the Chord Sequencer and the many assignable sliders and buttons. If I think a style is too busy, too loud, not loud enough, it takes about two minutes to tweak it to my needs. It can then be saved as a SB entry, a custom style, or even to the factory style location.
The Roland EA7 is also excellent for live performance, but does lack text display and vocal harmony. I love the weight, size and light, responsive keybed. Piano players probably wouldn't like it, but this isn't a piano forum is it?
The Yamahas are fine, but have that distinctive Yamaha sound that really hasn't changed much for many years. The Genos and the new PSR may be finally addressing that, but the demos still sound pretty much the same to me, unless you consider the audio drum styles.
I do find the Yamaha operating system and navigation archaic and the Registration system cumbersome, although, again, that has been addressed in the new models. I still would put Yamaha at the bottom of my list for live performance. As mentioned, your views can or probably will be different. I have owned at least 20 different Yamaha arrangers, but I feel they have fallen behind the other companies, at least until this latest generation.
Ketron or course has the live band sound down nearly perfectly. Factory bugs have been their Achilles heel. When they finally address them, they are really great for live performance. It bothers me that there is really only ONE person for support in the U.S. He does a great job of it, but is still sometimes hindered by Ketron Italy.
Just rambling here because I have a night off and can't go to sleep early after nearly 50 years of playing until Midnight or so.