Android smart watch - Big font?

Guys,

I'm trying to find a fitness tracker/smart watch for my Mum, she's getting on in years so some of the trackers with small fonts may prove tricky.

I was thinking of the Galaxy 4 by Samsung or the Fitbit Versa, probably 4. I can see increasing font size isn't typically possibly across Fitbit or garmin, so I was hoping a larger screen would st least work in my favour.

Anyone else who struggles to see the typical tracker size fonts with any tips it's much appreciated!