There's no doubting that YBS are one of the most consistent bands at the moment, and a number of their slightly lower contest placings could be attributed as much to differing views on the interpretation of the test piece than the playing itself. Equally, the format of the Europeans, with both Set Work and Own Choice, suits them very well, as they can choose something that will really showcase their best qualities.
Nick picks up on the key factor of David King, and they are definitely a class above with him at the helm. Having heard them a couple of times in concert under other conductors, they are still a very fine band, with the soloists never failing to come up with the goods, but it is not quite the same as when he is there.
As for the greatest ever, I've said before how I dislike the term "greatest ever", but they certainly deserve to be counted with the best - Dyke and possibly Faireys under Peter Parkes are probably up there as well, and I'm sure there wil be other names from before my era that will spring to mind.