Hi Frank,
The Invierno doesn’t really have much in the way of high country hiking, if I understand what you mean by that. Nothing like the Salvador/Primitivo. The Invierno has the first day’s ascents up to the Castle of Cornatel and then up to As Médulas, there is a short but steep ascent after the crossing of the Miño at Belesar, some serious up and down between Quiroga and Chantada, and then the ascent to Monte de Faro. Maybe I am forgetting something else, but there is no real mountain terrain like there is on the Salvador.
There is a lot of pretty typical Galician landscape, but what is different from the Francés in Galicia are the long stretches along the Sil River, some of it is just gorgeous. If you want to stay higher, the Salvador/Primitivo is definitely superior in that regard. But if you read some of the Invierno threads here on the forum, you’ll see there are lots of us who really loved it. Not all, of course.
Buen camino, Larie