Historically, Liverpool are bigger than BVB Dortmund, as they have won the Champions League in five different occasions. Dortmund have only one Champions League title which they got in 1997 after beating Juventus 3-1 in the final.
But the history means nothing today, because Dortmund were Champions League regulars until last season, who are dumped to Europa League this season. Liverpool, on the other hand, have not been playing in Champions League football for quite some time.
As we all can see, Dortmund are a little bit too strong for Europa League regulars. Of course Liverpool manager Jurgen Klopp knows everything about Dortmund inside out. But I doubt he can overcome his old team and move to semifinals.
Nonetheless, this match would worth seeing. I expect a warm welcome from Dortmund faithfuls to Jurgen Klopp.