It's all about the pressure with City in the CL imo. So considering this game from a pressure pov I expect us to be a little conservative but still attack. If they score first = 2-2 they have the away goal but we need just to score and the tie is ours.
If we score first, and especially early on, we're up against it for the rest of the game knowing a couple of Dortmund goals would make it much more difficult and the nerves kick in. When we have the nerves we can play for hours and just not score. It's our Achilles heel , so hopefully Pep will be more reulctant to go all out attack at the start but knowing his approach we're going to go all out!
tbh though anything could happen