I get 55 WPM without errors on the physical keyboard, compared to 45 WPM on the touch keyboard where I also have a significant amount of typos.
But tbh, typing speed is not the main reason. With the physical keyboard, I am much more accurate. I can use key combinations like CTRL+A/X/C/V (the microphone button is mapped to CTRL). There is an alternate mode (activated by pressing both shift keys at the same time) that remaps WASD as cursor keys, which makes e.g. selecting text (SHIFT + Cursor key) much easier. Also I can type while walking and not looking at the phone. And don’t get me started about how much of a difference it is when I use a command line, e.g. with SSH.