Nice review, but a couple of comments are called for -
There are 2 versions of the DW cases - 1 for V72 & 1 for 7750. The latter has a deeper caseback, the former's caseback is the same size/dimensions as the gen.
Phong's pushers are the same as the current version gen (& Ofrei), but, from the 2 watches I have worked on, their internals were filthy & needed overhauling.
Anyone investing in a V72-based build, is going to replace whatever crown/tube comes with the case with gen parts. DW's cases usually (but not always) require tapping for proper fit of both crown/tube & pushers.
The 1 area where Phong's cases pull decisively ahead of DW's is for pump pusher-style cases (6239, 6241, etc). DW's cases are all cut for screw-style pushers, which leaves the indentation in the case a bit too wide for pump pushers, which are narrower. You can see what I mean on this DW 6239 case
This is a gen 6239 for comparison
Phong's cases, like the gens, have a more accurate indent for pump pushers. Now whether this justifies the almost triple cost (over DW's case) is up to you. In my case, I went with DWs
Also, most of Phong's Daytona dials are hideous, with crowns that look like they were carved by hand (by a blindman with the shakes).