I like both EAI and DA.
The biggest difference?
Put them both on a table with the teeth sorta touching each other.
Notice the different heights of the teeth from the table top.
They have slightly different flange dimensions. in terms of standoff from the hub.
I have heard/read that one should pick one cog manufacturer or the other, and not mix them on the hub, because their threads differ slightly from each other and switching back and forth shortens the life of the hub's threads.
On my Bianchi Pista, with the stock Sugino RD crank, the EAI cog, with the flange against the hub, gives me the best chainline.