For me the differences are quite simple In my country The drums have a great significance
The type of music we play here Is music with a lot of bassdrum and the only keyboard That does the trick is Ketron I tried to work with Other brands and The best response I got from the crowd was with the Ketron sd 1 and my Audya
Korg for example Has a great right hand but on the left hand... it is not so good
I love the sound of Ketron keyboards
About sounds I use samples and also the drums are samples so I need instrument Who sounds good And that is all
At the end of the day it depends on what kind of music you play