I find that if sheep are tame, I:E pet lambs for example, they don't fear humans so much which can be a positive and also a negative. If sheep are too tame, pet lambs, they don't always like to do what you want them to do, they like to go their own way, which can be and is sometimes a problem. My sheep are not too tame, they do come up for cake, but I do have to run to catch them, mind you mine is a big flock. You can have problems either way. I prefer semi tamed sheep, I have semi tamed sheep. Semi tamed sheep are the best to have in my opinion, although you will need a dog. Personally I would go with semi tamed sheep, try to spend some time with them an get them used to a routine, remember there has to be trust between a shepherd and his sheep, they have to trust you.There are of course many advantages and disadvantages with any sheep, whether tamed or non tamed or even semi tamed. Semi tamed are the best in my opinion, not too friendly in that they will run after you all the time, but not too wild so that you can catch them. This is just my opinion, the question is what are you happy with?