I would need to watch each of them in person, preferably from an outfield seat, for a series or two, preferably against each before I would offer an opinion ranking them in order. I haven't seen Kiermaier in person, but based on what I have seen on TV, I do consider him to be top shelf with Bradley and Pillar. As to who is best or a ranking of the three, I would expect the differences to be minor, and I am not sure the differences between the 3 of the very best would be very meaningful or that anyone's opinion or any data measure would be definitive.