Feldspathic or emax for one central incisor? How brittle is the Feldspathic? Are we only talking about larger fractures? (Photo)

I was recently in an accident and I had to place a crown on one of the central incisors. We first tried a zirconia based Restoration but it was too opaque and color did not match even after several tries, changing the color of ceramics on top.We then tried E-max, twice. I was surprised to see that the base structure was as white as the zirconia one.The crown is looking more "dense", the color seems to be more on the surface, there does not appear to be any depth in the structure of the crown.