Dortmund was able to reach the finals last season, but got defeated by Madrid. Dortmund is very experienced in UCL and I believe that they will go far this season. Barcelona is in their best form and one cannot be underestimated, because they have scored a lot of goals this season. This shows that their attack is very active. However, the match is gonna be one of the best in the round of 16.
Dortmund seem to be concentrating more on the champions league like they did last season thereby abandoning the German bundlesliga to pay more attention to what seems very important to them, though they didn't clinch the trophy haven been beaten by Real Madrid in the finals but it seems they are on the verge of repeating what they did last season but it is dependent on the result they would get against French side Lille in the first leg of the round of sixteen on Tuesday night. Barcelona are currently enjoying a streak of winnings and they also seem to be invincible at the moment both in the champions league and in the la liga too and it seems it would be very difficult to deter them considering the fact that they have already dealt with Benfica in the group stages of the competition and might also do the same when they face Benfica in the knockout stages again.