I had thought of mentioning San Francisco. I didn’t because it’s an Apple-only choice but your comment makes me appreciate it more. Noto looks great. It seems like with these configurable fonts you can use the same face for body text and have it still look good in headings at a different weight.
For some reason the lack of distinction between open an close quote marks in Noto Sans really bothers me, they look almost identical unless you look real close. It is a fine font face but I have a hard time appreciating it because I can’t look past this—in my opinion ugly—design choice.
DejaVu Sans is also fine, so is Fira Sans, or Railway if you want to add some style in addition to readability.
Honestly if you don’t care about style your system’s sans serifs is probably fine (or DejaVu if it isn’t). And if you care about style go with a font that matches your design.
