Short answer:
As Stato highlights, what you want is a consistent reading so stick with the same gauge, once you’ve made up your mind what you are using.
Long story:
I have a Lezyne track pump but the gauge has no markings/indication under 20 psi so everything would have been guess work.
I then got a topeak smarthead gauge. That worked well enough. Although mine then went a bit ‘odd’ after a few months. I could not get a reading off it.
I’d seen the topeak fat bike pump on sale and bought one but, despite having a sub 30psi gauge, when compared to a friends topeak gauge it was completely different. Judging by limited experience of fatbike tyre thumb squeeze the digital gauge felt more accurate. (In fact he gave me the gauge as he didn’t use it in the end). I did experiment with both plus my Lezyne and another track pump all at 30 psi on my mtb and it was the fat bike pump that was ‘out’ the most in the end. 😡
I’d love one of those analog ones but think I’ve spent enough on tyre pressure already 😆