... when it brings a smile to your face ...
Eliot, do not second-guess yourself at this stage. In the BS, you are getting a set of very fine chisels, and one's which excel in paring and chopping dovetails.
I really enjoy handcutting joinery, and in this case, dovetails. What makes a great dovetailing chisel can add up to a number of features, and these may be prioritised differently by all.
It could be the blades having minimal lands, which enable them to sneak into tight areas. It could be the length of the blade - not too long - as closer to the work can offer better feedback.
It could be the steel and the ability of the blade to take and hold a sharp edge. Plus the thickness of the blade, with a thinner blade feeling lighter and more like a scalpel than a sabre.
The shape, size, length and width of the handle, and the balance of the chisel, is for many what a dovetail chisel is all about.
What makes a great dovetail chisel is one that brings a smile to your face when you pick it up. Good looking and well-crafted tools inspire me to do my best.
I purchased Blue Spruce when Dave Jesky started making them. There was nothing like them at the time, outside of Lie Nielsen. For different reasons, LN, Veritas and BS are all in the top tier. The one negative comment about the BS you will hear is that the steel is A2. And I say, so what. These chisels get frighteningly sharp and hold a the edge long enough to do a lot of work. On the positive side, they have the thinnest blades (at 1/8") and a light feel.
When I purchased mine, in African Blackwood, I added 1/4" skew chisels for clearing sockets. Dave was not keen on making fishtails, which I nagged him to make. Eventually he did make them. The largest I have is 1" and then down to 3/4", 1/2", 1/4", 3/16" and 1/8" ...

Enjoy yours!
Regards from Perth
Derek