The Portuguese team, in my opinion, is the team that has a higher probability of going to the next round. Inter's chances will change according to their victory in Italy. If Lukaku performs as well as in the national team, he is a striker who can bring the win for Inter and take it to the next round. Inter have to play well in both games. Benfica is a fantastic team this year.
Chance for Benfica becomes bigger recent weeks with very poor performances from Inter Milan in Serie A. We knew Inter Milan were very luckily to have a draw in second leg with Porto in round of 16. After that, they did not improve performance but only got worse in Serie A. It is hard to think that Inter Milan will be able to play better in matches with Benfica in quarter finals.
Porto and Benfica are similar quality in Portuguese League but in Champions League Porto have more experience than Benfica. However, Benfica can be a first Portuguese club can join Champions League semi final after many years since Porto in 2003 - 2004 season.
Manchester City - Bayern Munich matchup can be much more enjoyable from now on as it seems. Because I believe Tuchel will make a really good impact on Bayern Munich with his management style. He already got a solid win in his first game against Dortmund. They were already doing good in the Champions League though but I expect them to be even stronger now.
Guardiola and Tuchel is going to face each other once again here after a long while. Let's see which one of them will be victorious this time.
Without Tuchel, Bayern Munich with two impressive matches against PSG would bring more concerns to Manchester City and Guardiola. With appearance of Tuchel and a big win over Dortmund last weekend, Manchester City would have more reasons to concern about their matches with Bayern. They will have to beat one of biggest and most successful clubs in Champions League, just after Real Madrid and AC Milan.
Additionally, Bayern Munich actually have good form lately that would bring more challenge to Manchester City.