Opinions for a new digital piano

[pakkun]

Hello, I would like to buy a new digital piano.

I play mostly classic music.

I currently have a YAMAHA P-225, but it doesn't satisfy me anymore. It only has very few piano voices, and I am not liking the sound anymore, I find it muffled especially the lower notes.  :'(

I am considering the YAMAHA DGX-670 and the YAMAHA P-525.

From what I understand the P-525 could be better, but I noticed that its display is smaller than the one on the DGX-670, and my concern is the practical use to easily select and navigate the piano sounds, reverbs settings etc. 

I wuold really like some piano voices to make Chopin Nocturnes and Waltz sound beautiful with clear notes. 

What would you reccomand between the two ?

Thanks in advance