which code browser to use?

Hi,

What are the pros and cons of the different code browsers I see in my
image (it's based on Damien Cassou's squeak-web-95-2.zip). I see:

* Browser (appears to be the default)
* HierarchyBrowser
* OBSystemBrowser
* ShoutOmniBrowser
* eComspletionOmniBrowser
* Tric-RefactoringBrowser
* WhiskerBrowser
* OmniBrowser

I find myself switching between different browsers and not finding one
which provides a superset of browsing functionality.I feel must be
missing a trick. Is there a prefered browser amoungst more experienced
users?

How do I register a prefered browser as the default for alt-b and
tools tab->browser?

Thanks

Nick