In the last season, Inter not qualified to round of 16, while Arsenal stopped in semi final.
In the last two season, Inter reached to final, but it was because they were in weak group, they met Porto, Benfica and Milan.
But, I consider Inter is better than Arsenal because Arsenal performance aren't that great and they never won Champions League.
Thinking Arsenal will beat Real Madrid is already impossible in the first place.
In the last season, Inter Milan out through lost against Atlético Madrid in round of 16 and Arsenal faced exit after losing against Bayern Munich into quarterfinals in this season situation is better for Inter Milan as they are in quarterfinal while Arsenal going to face Real Madrid in quarterfinals.
Now just 8 teams remaining in event and all are on same level of quality which is interesting we can't predict about any team with most chances Arsenal will be the toughest challenger for Real Madrid and Inter Milan will be also create problems for Bayern Munich. UEFA Champions League is always full of upsets as we already have with Liverpool and Manchester City gone cheaply now which team is having strong chance of going into last four this is interesting with Barcelona is one of the most favorite which is another big surprise PSG performance is also impressive.