1. As bonsai "master" who "teaches" bonsai online, comparing Peter with Ryan, I would say both are great, differences are in their different teaching styles, both are great, however, someone may find one particular style more preferable than the other.
2. S shape is like GED, to many people GED might be the end degree they will ever pursue. Many people may just satisfied with being able to make s shape "bonsai", and no more.
3. Peter does have premium bonsai items, as already shown by
@leatherback earlier.
4. Bonsai as art product, for those high end items, comparing and determining which one is better it's almost mission impossible. People paid 119.9 million for "the scream", others may think it's just crazy.
I liked Peter's videos a lot, now I like Ryan's video better in some way. However, I find myself fast forwarding some times.
Peter talked/did/showed a lot s shape "bonsai" , it does not mean he can only do s shape. This is obvious, but sometimes it's so obvious that one may forget.