I understand the quality of thorniness as a criterion for excluding a bush from one's yard. I've got quite a few that are very thorny! I really don't mind very much about that, since I try to place them away from the paths, in the centre of the beds ( my beds usually have three lines of bushes, sometimes even four); Thorny climbers at the back of the beds, where I hardly pass ever. Thus I only get pricked when I move about distracted or clumsily...then I deserve to get pricked...
I find roses so delightful that I prefer to ignore this question altogether when trying to add a newcomer to my yard.
I've read that some people find that as a great advantage to stop tresspassers! ( bypeds or tetrapods). As usual its the way one sees an issue that finally counts...
Arturo