I look at this a little bit differently----i'm not thinking '' I will get that breed because it's better/different'' rather I am asking ''where can I find this trait to improve what I already have in my sheep''
So for wool shedding I went to the Wiltshire horn because it has the best shedding ability I have found
For a hair coat and parasite resistance you look to the pure hair sheep breeds (BBB /Damara/Katahadin )
For growth you go to the Texel/Charolais
For milk the Lacuane
For easy of lambing and thrift one of the hill breeds
Then you have to find the animals within these breeds that have the traits that you want because there is plenty of variation out there----for example I have maternal wool shedding maternal rams whose offspring grow faster than some Texel rams (done the comparisons on 200 ewe flocks)
all the above is a convoluted way of saying horses for courses