The game is pretty much even. But Monaco wrecks their league and kicked butt against Man. City. which is a.) trained by Pep and b.) in the PL and so I guess way more popular and known in the USA.
Both Teams rely heavily on their Offense, so it probably comes down to “Who scores more goals” like it did against Manchester for Monaco.
Dortmund should have the bigger Homecourt-Advantage, so hopefully that will come into play aswell :)