I like having a good visuals on my screen. I like enough information (some would say too much) displayed at once. That means I like not too big of a font size. Unfortunately I have to wear some stronger glasses. That means I’d go for clear cut fonts without too much serifs, etc.
Right now these fonts are my favorites:
Comfortaa is used here on the web site, but I might exchange that one for Jost*. Jost* seems to be nice when you want to do some writing, too.