Some of my favorite go to styles are conversions, and deeply edited
I use a Roland G70, and many onboard styles are useable for me, but I have favorites, from Korg(20 plus), Technics(6-8), and maybe one or two from Yamaha..
I like Ketron styles but they don't convert well..
Yamaha conversions are poor at best...and I don't like many Yamaha styles to start...actually there are a lot of useless styles.
Technics "jazz" styles are really nice on the G70..using the sounds from Roland they are way better than Technic sounds..
I have to say the Korg conversions are also better on the Roland G70 than on the Korg..I think drums and some other sounds are much better on the G70..
I should mention Roland styles don't convert well to Yamaha either...the common factor is Yamaha..