Densheild tile backer board use advise needed
Whether one product is "better" than another is really subjective. What I can tell you is that denshield is a more advanced product, eliminates the need for a membrane, and I find it easier to use than cement board for sure 

However, I would get four sheets instead of three. Then you only need to have three vertical seams, total: two corners and one along a stud.
Vertical seams in sheet goods are objectively better. They will be better supported, and you'll have minimal seams (as that seems to be the likely concern).

Plus, with no horizontal seam you don't need to be concerned that water can run laterally and seep through a poor seam.