Both teams are perfect match for each other because they are both equally strong. Juventus currently has the best performance after a long time, and this makes it difficult to predict the match. Inter have been very consistent in both local and international competitions, and I don't think that they will want to jeopardize with their reputation by allowing Juve to reap that off from them.
The match is very important for both teams to win, because the winner in this match might finally become the winner of Scudetto this season. However, the match is unpredictable and none of these two clubs should be underestimated.
The winner of this match is not enough to determine the overall winner of the Scudetto. After this match, any team that wins will only take over first place by a small margin, which should not give them the false impression that they have already won the league because some of the teams they will be playing against are not small teams that can be underestimated; they can still come and collect points from the team in first place, giving the team in second place a good chance to move up to first place. This is an indecisive game, and the implications are high, so both teams will want to win.