Seed vs clonal propagation of species (and rootstock)
Now this is a general question not limited to rose species. I thought I would ask here since many knowledgeable people seem to frequent this forum. Are there any reasons (scientifically proven or not) to believe that a (genetically stable) plant grown from seed can be more / less vigorous than a clonal plant (such as one grown from a cutting)? I know somebody who advocates that fruit trees should be grafted to rootstocks grown from seed rather than from cuttings but I'm not sure why.
In the same vein, I understand that most rose rootstock (at least rootstock used in Europe) is grown from seed. In fact I know there are seed farms in places like Turkey that provide seed to European rootstock farms. I believe this is done for production cost reasons but maybe there's another reason also? What about rootstocks used in the States?