Let us analyze both of their records to see where they lie.
This will most likely be a striking battle
Jared has been beaten multiple times, but it appears his weakness has always been masterful strikers. Case and point, his last losses came from Jan and Reyes, two very polished strikers in the light heavyweight division. At middleweight, Jared has fought primarily grapplers, and his one win against a decent striker came against 42 year old Anderson Silva.
Robert Whittaker on the other hand has recent broken through the mold of his greatest weakness with the win over Till. While not the cleanest win, Whittaker proved he was capable of fighting head to head with a counter striker, his greatest weakness as a fighter. Robert Whittaker has a more reliable record when it comes to fighting explosive strikers with wins over Romero, Hall and Till.
Based on this alone I think Whittaker will bring the more diverse striking arsenal into the bout. Which means the battle will really be decided over who has better defense. Whittaker has shown to lack defense at times, especially against Yoel and Adesanya, both masterful counter strikers. Jared's defense has relied heavily upon him using his strength to block attacks. and wading through the storm much like Yoel 2.0.
If Jared is a good enough counter striker he will win, though there is very little evidence to suggest he is masterful in this regard. A betting man would choose Whittaker, but Jared could definitely get it done.