Based on the available odds, a draw is least likely to occur. You can choose both teams to score or Dortmund to win, that's what I'm betting on for the match. Even though Dortmund is not the favorite, Dortmund is a team that has more experience in the Champions League than Sporting. Not underestimating Sporting, but in my opinion favoring Sporting in their home game to win seems like a risk of losing.
If we refer to the odds given by the bookmaker, of course the home team has a greater chance of winning the match because Dortmund itself has been in very poor condition and you can see that in the Bundesliga through the results of their matches recently. So the small odds on Sporting Cp are proof that the home team also has a chance that exceeds Dortmund even though both of them might score goals in the match. And I also think that their match will be quite fierce in the near future.
Actually the odds of both teams are not so obvious, if in the handicap version Sporting is superior with 0:1/4. which means, this match has the potential to be a draw even though it is held at Sporting Lisbon's home base. even with the odds presented by the bookies, I interpret that both teams have almost the same probability of winning the match in the first leg. the only advantage of Sporting because they act as the home team, full support from the fans will greatly help the motivation and confidence of the Sporting Lisbon players when hosting Dortmund. talking about Sporting, since Amorim left and was handled by Rui Borges their performance has been unstable. talking about the Dortmund squad, what doubts them is because this is the second match for Nico Kovac who is currently handling Dortmund. moreover Nico Kovac failed in his first debut at Signal Iduna Park against Stuttgart, Nico Kovac failed to win even though they played more dominantly. but still, their chances are still open with fairly competitive players. so too with Sporting, they are playing at their own home base. It seems like this match will be fierce, but we'll just have to see what the two coaches will implement.