The Korg system allows for more custom access, with fewer buttons on the unit.
ie:
You want songs to set up and have the right sounds, rhythm, tempo etc ... use the songbook, or have the Performance turn ON the style with the sounds.
(make sure the tempo lock is OFF)
If you use lots of styles, but change sounds on the fly ( like I do) then turn Style Change OFF, and when you select a Performance, only the kb sounds change - NOT the style. In this scenario - the tempo lock can be ON.
I like this system