This match is an equally important match for both of them so they will try their best to win. Juventus will wait for the results of Inter Milan's match in week 21 and Juventus is really looking forward to Inter Milan's defeat in this match because Juventus is in an unsafe position because Inter Milan can take over that position if they win the match or draw, but I think Inter Milan can definitely win it otherwise it's possible that the match will be a draw as you said because Inter Milan is playing away so it's quite tough.
Yes, Fiorentina gets a big advantage because they play at home, but Inter Milan also plays quite well even though they are playing away, so Inter Milan still has a chance to win if Fiorentina is careless and doesn't succeed in taking advantage of their home opportunities. The competition between Juventus and Inter is still quite interesting because of the difference both are still too small so both clubs still have a chance to fight for the league title.
The season hasn't been quite adventurous for Juventus as they've been indicted to not taking part in the Europa League. They've been focusing their strength on the domestic Serie A league and they've been doing excellently well in it. They've even got a greater chance of being far ahead in the standings than the likes of Inter Milan because for others, after the league games, they'd still have to play the continental tournament and this will definitely affect players' physical capabilities too.
Although inasmuch as a weighty gap is expected of them, Inter Milan has made it difficult because they've also been in their best form. The team are using this season to put in more work to ensure a spot in next season's European cup tournament and they definitely would earn it.
They've got good set of players, right squad combination and their coach is doing his best part and giving them the right tactical approach. I don't know if they've got choice of changes to make during the mid season transfer window but at this state now, Juventus are good to go to some extent only if extra energy wants to be pumped into the squad to increase their efficiency too.