I don't understand how exactly the Earthcrack Bracers from Lord Rhyolith are best in slot for Frost DW when the Giantform bracers have hit and mastery, and according to Elitist Jerks the stat priority difference from haste and mastery is 1.47 versus 1.44 which is a very small number for 378 item level and then at 391 it's 1.78 for haste value versus 1.57 for mastery, which I do understand is a larger number. But for someone gearing through normal Firelands content right now and taking Frost DW as the main gear preference, would it not be better to have some extra hit rating and go for the Giantform Bracers just because hit rating gives you more white damage?
I suppose buying the Giantform Bracers is still a suitable upgrade to my 359 item level Electron Inductor Coils until I get the Earthcrack Bracers, but I still don't see the point of having a useless stat and haste on one item versus an item that helps white hit chances (and can be reforged to haste anyway) and has mastery on it which is just as good as haste for my item level.