Hi Hau,
IMO- the "Fingered-Mode" should be the way to go. Say for example you want to play a C-chord (c-e-g) if your not playing those notes then the display will not show what "chord" your playing until you play the right notes. That is a very good way to learn chord as well. From there I would move to "AI-fingered" mode I like that setting because if I wanted to play a "c-add b-bass" it would sound correct or I could just go from come c to c7 and hit the b-flat below -c-. From there AI Full KB if you play alot of "piano or organ" sounds.
I hope this helps, best of luck
jedi