Judging from the Georgia type sample above, it appears to me that Georgia letters are a bit larger in the middle section, and the letters are a bit more evenly spaced (lowercase I's and L's not scrunched quite as closely to neighboring letters). These attributes do render the text a bit more readable.

All fonts are assigned to a "font family", the main ones being "serif," "sans-serif" and "monospace" (think typewriter printing). If a font specified by a web page is not found, the system/user default for its font family is used instead. So unless you're using some unusual-looking font like Papyrus, it doesn't much matter if you have that font installed.

So this may be a case where the "savvy" folks gave good advice: Georgia might be a better choice. The proliferation of phone-based surfing argues for sticking with only the most common fonts. I'm not sure whether Georgia is one of the core fonts you can expect to exist on all systems/iPhony devices, but I've not used a computer without it since the Dark Ages of computing.

Viewing your installed fonts is easy--open any word processor and open your font selection dialog. It will usually show you a sample of whatever font you select in the list. For a larger sample/comparison, type a line or two, then copy it and paste it several times. Then select a sample and change its font. Simple, no?