Seeing the odds given by bookies is more profitable for Sporting which has lower odds than Dortmund,it is possible because Sporting will play as the home team in the first leg but Amorim's departure has made Sporting's performance decline drastically in the UCL because they have not won since Amorim left so I prefer Dortmund who will most likely qualify for the last 16, because I saw Dortmund win their last game with the new coach.
Many at times odds don’t determine the outcome of games played. I have considered odds a number of times and lost including 5.34 odds winning away to 1.25 odds so I will say odds don’t always decide outcome of games. Sporting might not be doing very well at the time but you can’t completely write them off, after all Dortmund on the other end have not been doing so well themselves so it looks like a 50:50 game to me, anyone can win and Sporting have a home advantage so it could go in their favor.