When comparing KaiTi vs Verdana, the Slant community recommends Verdana for most people. In the question“What are the best programming fonts?” Verdana is ranked 68th while KaiTi is ranked 94th.
Ranked in these QuestionsQuestion Ranking
Pro Very clear even at small sizes
This font is included in windows by default and is really easy to read at small sizes, allowing you to keep more code on the screen. It was originally designed for simplified Chinese.
Pro Free with Windows
Pro Compact while light
Packs lots of information into your screen space while remaining clear and never looking crowded.
Pro Renders perfectly at all sizes
Again, particularly in Windows
Pro Looks absolutely gorgeous in Windows
Looks good elsewhere as well, but the world-class hinting here really comes out with the windows rasterizer (probably optimized for it).
Con No differentiation between 0O and Il
Zero O and cap-I lower-l look the same
Con Not monospaced
-if that is an absolute must for you. But don't assume it is until you've tried without...