Perf Cost: Texture Object & Texture Sample vs Texture Object & Texture Sample *2

Thanks for the input. I am also curious about texture arrays. I am considering using them to lessen draw calls rather then building 1 atlas texture. The question there is… does it consider a texture array as 1 texture to sample/lookup? And if so… is it like sampling an extremely large texture if multiple textures on it? Or maintain the speed over a few smaller ones?