Probably B. 'Lana' which is an easy bloomer and a great grower. The other superba type cane would be 'Sophie Cecile' which looks very much like 'Lana' but the leaves are more incised and is a very shy bloomer (rarely blooms).

Here is a cane I bought 3 years ago that is not Lana but probably not Sophie either since it was a great bloomer. The one on the cart is the one I picked up for $15 while the one on the floor was $20.

Here is an example of Sophie that I've had for 30+ years but never bloomed.

Irene Nuss (another great superba type cane blooms very well but the silver streaks disappear as it matures to a dark green luster). This is a cane I gave my mother a few years ago and she had it looking pretty good last year. You can see the silver streaks on the new canes at the bottom of the pot.

Lana

Check out Brad Thompson's Begonia World for more canes and Kartuz where Brad works.

Perhaps the cane you show is one of Brad's newer hybrids?

Cane begonias for the most part are easy to grow and propagate but there are some exceptions to every rule. For example the Mallet type canes are notorious for mildew indoors (Sinbad, Don Miller, Maurice Amey for example) but do wonderful outdoors in heat and at least a few hours of sun.

Here is a small sample of some of the canes and other types of begonias I grow.

Even in all day full sun (with some shade at times from the taller elephant ears) they do great - just make sure you keep them watered.