There are many classic and modern haggadot. Any recommendations? If so, why? And if available online (such as at HebrewBooks), please provide a link.
The Hirsch Haggadah is excellent, and unusual in that it contains extensive commentary to parts of the haggadah that often get short shrift, such as kiddush and birkas hamazon.
Haggadah Migdal Eider is a great and classic all rounder.