We can see that Sporting CP is slightly more favored, I think it is because they act as hosts, besides Dortmund current performance is indeed declining. However, we cannot completely ignore the fact that Dortmund were last season Champions League finalists, they have a wealth of experience to turn things around. It is possible that the match will end in a draw, and if want to bet, I think the BTTS option seems better.
In as much as bookies have tipped Sporting Lisbon as the favourite to win this encounter, I would not advise betting against Dortmund. Though these two teams are not at their usual best as sporting cp has seen their playing style and momentum slow down because of the change of manager and Dortmund also equally been inconsistent this season and have had a lot of inconsistent performances. I don't see a winner in this contest and I will rather go with your prediction as it seems to be the best option.
