One reason I really love Verdana is looks great on all browsers. And it’s a big enough reason. I think as a whole, most Sans-Serif fonts like Verdana, Helvetica and Arial, do look good because they tend to render them properly on most browsers, on most operating systems.
Georgia, Times New Roman, and most Serif fonts tend to look bad on some operating systems that do not have anti-aliasing. If they do, then it’s probably not a good idea to use them in small fonts. Georgia is used mostly as a headline because it looks great in large fonts.
Arial is probably the most used because it is easier to read. Times New Roman is standard in Windows. Comic Sans MS is informal, but some people comically like it.
Overall, I still think Verdana is best – for me anyways. I don’t know for you.