I never liked Calibri when it was pushed aggressively by MS and showed up everywhere - I prefer Arial or Helvetica for sans-serif, and think TNR is a good default for serif, with Computer Modern a close second.
Computer Modern is nice on paper but a bit spindly on screen, IMO: Knuth's other serif font, Concrete Roman, works better for that.
Computer Modern is nice on paper but a bit spindly on screen, IMO: Knuth's other serif font, Concrete Roman, works better for that.