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The difference if fairly obvious, no? The IWP home page will only show files that are IWP enabled and the link there will take them to the file through IWP.
The group page shows all files in the group, whether they are IWP enabled or not.
If you don't like the way the IWP page looks like you can certainly replace it with a custom page that you make yourself. Do some googling on that, should find plenty of examples.