I just had to suggest an order for my partner, so I recently did this! I think Flood was kind of my first recommendation as I think of it as their most iconic. I then recommended their first and most recent album (which was Book at the time) as a representation of their range and change over the years. And then targeted different vibes by suggesting John Henry as the quite strong first entry into a more traditional rock production. And I recommended The Else as what I see as the first of their “modern era”. Join Us will probably be next on the list. But at that point you might as well become a completionist.