Part of the legibility is your screen time, how much time did your spend reading that font. I'm using DejaVu Sans for about 10 years and while there may be slightly better fonts, it's not worth it to change it. Just pick one font and stick with it, don't change it every six months. This goes for websites and OS as well.

Arbitrary changes are annoying because you are losing your hard learned visual parser settings.

On mobile when I'm about to read longer article I use plugin to change all elements to medium size black on white sans-serif.

For legibility, consistency and familiarity is more important than finding the perfect font.