Not quite, tile based GPUs tend to be better on Z-Buffer bandwidth but not all mobile GPUs are true tile-based GPUs.
The number of tiles can definitely change, it's something Qualcomm calls out directly in one of their talks[1]. As your tile count increases so does your setup cost for your drawcalls.
The number of tiles can definitely change, it's something Qualcomm calls out directly in one of their talks[1]. As your tile count increases so does your setup cost for your drawcalls.
[1] https://youtu.be/SeySx0TkluE?t=41