Choice between korg sp250, korg sp250WH or yamaha P-140.

Hello everyone, being a beginner I would like to approach the world of the piano, but since I cannot afford an acoustic one, I am leaning towards buying a digital one.

With a budget of about 700 euros, what is the choice that allows me to have a reliable instrument with ''almost'' the sound of a grand piano?

I accept advice on other brands or models.

I thank the administrators and users in advance.