Well both teams are good, they're the strongest In the Serie A this season and the title race is between both. But if you ask me, I'll say that Inter Milan has more chances of winning than Juventus, I think the morale and team spirit from the UCL final last season came with them to this current season and i love their passion and confidence in every game they play, they show class against weaker team and come out victorious with a good scoreline as well as standing their ground when they come across other top teams.
Well anything is possible, Inter could carelessly loose points and give chance to Juventus to get above them, well it's easily said but not very impossible. However Juventus finishing 2nd place is not a bad idea after the whole points deduction they suffered last season, it didn't break them but rather got them stronger.
Yes if we take Inter Milan as a reference point and they represent 100%, I would put Juventus Turin at around 90% or maybe slightly higher than that. But now there could be one window of opportunity for Juventus Turin. When all the competitions in the Serie A, Super Coppa and Champions League run simultaneously, it's possible that Inter Milan loses some important players or try some rotation and drop some points. As long as Inter Milan stays only 2 points behind, the pressure will remain high for Inter Milan to not lose a single point.
However, on February 4th there is the game of the games between these two teams, but Inter has the home advantage. Juventus must try to not lose that game. If they lose it, Inter be far more relaxed for all the games to come.