Tigris and Euphrates (German: Euphrat und Tigris ) is a German-style strategy board game designed by Reiner Knizia and first published in 1997 by Hans im Gluck. Before its publication, it was highly anticipated by German gamers hearing rumors of a "gamer's game" designed by Knizia. "Tigris and Euphrates" won first prize in the 1998 Deutscher Spiele Preis. A card game version was released in 2005.

Can we draw the following conclusion?
The card game version of Tigris and Euphrates was more popular than the board game version.
It's impossible to say