RE: Grizzly Broadheads
You could ask 100 hunters and possibly get 100 different opinions. Some like 2 blades, some like 3, some like 4. Some prefer factory sharpened, some prefer to sharpen themselves. Every broadhead on the market boasts of kills made with them, and as long as the arrow is put in the right place and doesn't come apart it will do the job.
I prefer a pass-through myself, if I do my part right. I agree that a broadhead that stays inside the animal is only going to do more damage as the animal moves, but if you put a hole through both lungs it isn't going far regardless, and the blood trail will generally be better with two holes vs. one, especially if you shoot from a tree stand or other elevated position.
You summed it up nicely though--shoot what you are confident with.
Chad