I prefer the native Mail app, with Yahoo's mobile web app (via Safari) as a backup. I don't use Hotmail, and to be honest I barely use Yahoo. Of my three active email accounts, it's the least used.
i got ibismail and love it. by far better than stock and the ability to creat folders easily as well as the huge plus of being able to select all to delete rather than each individual one is worth it in my books.