1. Apple Safari
1.1. Pros
1.1.1. Works great on Mac systerm.
1.1.2. It runs a few stability fixes for Mac OS X 10.6.8 and Windows and yes, it is possible to install the software for Windows.
1.2. Cons
1.2.1. Tabs look bad.
1.2.2. Safari pulls down its updates through Apple Software Update, which requires administrative privileges to run in both OSes.
2. Opera
2.1. Pros
2.1.1. If you want a mix between browsing performance and battery lifetime, your best choice is Opera.
2.1.2. You are generally guaranteed access to the most cutting edge features before anyone
2.2. Cons
2.2.1. Opera doesn't offer an MSI for centralized installation
2.2.2. Once you're on a page with a bad certificate, there's nothing in the address bar or elsewhere to indicate that the certificate is bad.
3. Google Chrome
3.1. Pros
3.1.1. Google Chrome runs the fastest
3.1.2. Chrome would routinely score ten times more than Firefox and IE wouldn't even feature.
3.2. Cons
3.2.1. Flash problem
3.2.2. Chrome has synchronisation too, but it doesn't extend to open tabs.
3.2.2.1. New node
4. Internet Explorer
4.1. Pros
4.1.1. IE9 has the ability to split individual tabs into different processes.
4.1.2. IE9 can recover from crashes and unexpected shutdowns
4.2. Cons
4.2.1. Internet Explorer does not support syncing.
4.2.2. The web browser is not the quickest in real world use.
5. Mozilla Firefox
5.1. Pros
5.1.1. Your history, favorites and current tabs go with you from machine to machine.
5.1.2. Firefox 4 also boasts some excellent synchronisation features.
5.2. Cons
5.2.1. Firefox has crash protection but it's still a one-process browser, so something going wrong in one tab could still affect everything else.
5.2.2. Firefox also has some permissions-related issues that prevent updating by any user account other than the one that originally installed it