I felt the Kaiyodo/Hurricane one was much better than the HT. I really didn't like the HT one when I first had it in hand - couldn't understand how anyone could feel it captured ANH vader at all. But with some work the HT really does look way better - it's a solid starting point.
And in looking at rarer pics where Prowse has helmet on and off in the same camera set-up, and pics where human heads are close and in the same plane as the Vader helmet, you can really see that the helmet's not as big as you assume. The first giveaway to me was when I saw the stormie and Vader helemts side-by-side and the Vader helmet seemed small compared to my perception of it.
So even though when the Kaiyodo and Hurricane facemasks arrived I thought they looked noticeably too small - I have since realized that while they may be just a hair underscale (and do have a few other inaccuracies,) they are actually pretty accurate size-wise, and it's the HT which is too large overall (which it is,) a fact that most didn't seem to pick up on. There's this sense that because Vader feels "big" in our perception, his helmet must be huge, but it's not really true.
The one key problem with the Hurricane/Kaiyodo is that there is no perfectly matching dome for it (the available ones are all either a hair to large or a hair too small,) whereas the HT does.
