Lyn
The Villosa varieties tend to be sturdier, stronger plants and hold up to extreme conditions better than the other varieties. I will say though, the conditions for roses are so different than the heuchs. The roses can tolerate a lot more sun than the heuchera.
I think the heuchera probably do so much better for Julia than the rest of us. The heuchera plants really like her Pacific Northwest climate.
I have both Amethyst Mist and Silver Scrolls. They have done fine in my garden. I have them growing under a Fringe Tree with the Amethyst Mist getting a tad more sun than SS.
Carolyn