i'm with terry.
i've tested twin blade double bevel heads that i ground at two different angles, both steep and gradual, then lightly honed and stropped each to remove the burr. the steep angled blades were MUCH more durable than the thin edged blades, but the thin edged blades were "sharper", as sharp as a stropped straight razor. i know both types would effectively kill, but the more fragile one got me concerned for durability of both use and handling.
i use steep angled, really sharp broadheads. the last kills i made were this past june. the very sharp wensels went completely through both hogs at about 17 yards. both heads were still sharp upon retrieval, which tells me they had to do some serious damage while passing through the animals.