Mac (9694 programs)
Pros: Makes transfers of all kinds much easier. Easy to setup shortcuts. Allows you to save text snippets for later reading with the URL. Installs packages automatically for you.
Cons: No direct support for other online services, such as Picasa or YouTube.
Pros: Has tons of features, from an IM client to online videos. Well-presented and polished interface. Includes RSS feeds. Widgets expand goober Messenger.
Cons: Interface is a little cluttered. Radio and video channels are obscure. Video, mobile and landline calling not available yet. A lot to pack into what is essentially an IM client. Supported by ads.
Pros: Supports a wide range of disk image formats. Simple drag-and-drop interface. Reliable ISO output with stable performance.
Cons: Free mode has functional limitations. Advanced features require a paid license.