dont be silly, if you guys are really honest you know the killer is 0 frame next delay.
in case its not obvious here is the hit benefit you get from each nd step starting at 4 frames (which means in frames: hit, nd, nd, nd, nd, hit):
4 frames: x1
3 frames: x1.25
2 frames: x1.3
1 frames: x1.5
0 frames: x2 and extra
imagine now going straight from 4 frames nd to 0:
1*1.25*1.33*1.5*2=~5
which means you theorettically hit about 5x as many times per attack and it translates into 500%wdm compared with 4 frames nd that doesnt get this multiplicator,
however this is not the end of the story, since every (assuming 95% hit chance cap) hit is going to connect, you also get the benefit of the overlay of multiple missiles, as well as greatly increased proc rates.
and depending on the underlying mechanics of thorn field, it may well hit much more often, depending on how it creates its "hit boxes".
i hope now its clear now how next delay has increasing returns the lower it gets
the 0 nd mechanic is quite fun and i hope it can be kept with skill changes, but it makes a huge difference in how strong a skill is, much more than a flat dmg increase, as you can see here the amount of procs might even make up for a very low wdm