Trossard has banged in a few goals recently but TBH I have a strong preference for keeping Merino as our focal point as I think he's done an excellent job as cover and unlike Trossard, he brings people into the game more naturally, which is important for this team, particularly in the CL.
I really hope Arteta comes up with a suitable fix that allows Merino to play upfront, though unfortunately I think he will stick with the Trossard option due to his recent goal blitz and the fact that he didn't experiment when he had a chance in the league.
I really hope we can come out from this leg without losing and have a stronger team available for the 2nd leg, which is where I believe everything will be decided, unlike the Real Madrid game.