Most scenic days ? - I think, it depends on what kind of landscape you like or expect.
If you like the meseta, then you will find the whole VdP very attracive. If you are looking for mountains there are only few sections. The dehesas, that´s open country with some trees and cattle in it.
There are some sections with lots of road walking or where the camino is in sight of the road:
Sevilla - Santiponce (bus)
Castilblanco de los Arroyos - Finca El Berrocal (no bus, but in the bar you can ask for a taxi?)
Torremejía to Merida (bus)
Valdesalor to Cáceres (bus)
Cáceres to Cassar de Cáceres (bus)
Aldeanueva del Camino to Banos de Montemayor or Puerto de Bejár (bus)
These are sections which you may want to skip.
If you think that walking through vineyards for nearly 30 km is boring, you may even want to skip the section Villafranca de los Barros to Torremejía.
BC
Alexandra