Where should Daeron direct his armies? (Patreon)

At preset, Daeron has reached the Twins and the Freys are besieged from both sides of the Green Fork. Daeron is now in control of the armies of the North, Vale and Riverlands. Once the Freys are dealt with he has to secure Harrenhall. 

However, Daeron can do this two ways. 

He can split his army in two. Allow one portion of his army to take Harrenhall thereby securing southern Riverlands. Then he can focus his army on the Weaterlands and take it castle by castle all the way to the Rock. Keep in mind, the Lannisters have never been this weak. If Cersei orders her kin to protect King's Landing because of Daenerys, then Daeron is free to take the richest Kingdom of Westeros into his control. 

But, there is another option. Daeron could put his plans for attacking the Westerlands on hold in favour of marching straight into the Crownlands. This option means Daenerys and Daeron will be forced to negotiate. The rest, I leave to your imagination.