Using single row flipbook texture with fewer shader instructions

Is it a bad thing to prepare a flipbook texture in such a way that it contains a single row and use a simpler version(2 instructions less) of the FlipBook material function?

I’m concerned about the kind-of-weird aspect of the ratio of the texture(16:1). I found out that square textures are better in mobile projects for efficient use of memory. Is this true for desktop as well? If so, how can I know whether using a square texture or using 2 less shader instructions is better? There’s no significant change in frame rate between the two.

Thank you!