For second leg Barcelona potential losing both their crucial players between Gavi have confirmed with yellow card accumulation and latest news about Pedri have absent several weeks later after injuring. Talking about potential team have chance to qualify next round seems Manchester United with advantage playing at home is more favorite than Barcelona.
I think draw is crucial result for up coming second leg and both team between Barcelona or Manchester United have the same chance qualify to next round, there are not important for Manchester United with away goals and next draw on second leg will have taking trough penalty kick for the winner.
Pedri is injured, Gavi has accumulated cards, Busquets is injured and this has given Xavi a lot of headaches as he prepares for the second leg. It's up to who will fill some of those voids, I think at the same time it has worked in Manchester United's favour.
I'll look into that possibility later, but I think Manchester United could be the favorites at Old Trafford. About Manchester United, they are much better now and I'm happy with what they had at Camp Nou yesterday.