I've used a few different brand of 2 blade heads over the last 11 years. Magnus, zwickey, ace, grizzly and zephyr to name a few. All have performed as they should with no issues in durability, except for the hitting of a big rock once or twice. I haven't notice any difference in penetration with the different heads. The vast majority have been pass thru's with the exception of the ones that hit the off side shoulder or leg bones. On whitetail deer, I wouldn't be too concerned about any difference in penetration between single bevel and double bevel heads. Any of the heads I mentioned above will serve you well, if you keep them sharp and place the arrow where it needs to go.