It depends on what sound you want to archieve..

For a live sound... Rock and Ballads..
I stick to drum, Base and a guitar..
And then play the keyparts on top of that..


But when playing Jazzy, there is 2 choices, go for the whole swing band, or just a small jazz combo...
Both give very different results for the same song... Where i love the bigband to sound all out, i prefer the jazz combo small, maybe even just drums and Bass..


Its the power of an arranger to create a backing that suits your needs..
The good thing about to busy styles, is that you can mostly easilly strip them down
But if you have a very basic style, it takes more work to get that a little busier..

I think this is what Yamaha styles really do well
In general they are quite busy..
But stripping them down often gives the wanted result.


I also think Ketron is best for edditing the styles to your liking,
with their style modeling. Especially if you want to make a style busier
Its much easier to archive that with the way style modeling is set up.