I use Thunderheads (I actually had to open up my bowcase and look). I haven't lost a deer with them, of course I've made some pretty good shots. If you put the arrow where it belongs, I think they will all work. My entrance hole on the doe I shot Monday night was pretty decent, the exit hole was nothing to right home about, but the deer only went 45 yards, and actually walked closer to my car, for an easy drag after gutting. Perhaps the Thunderheads persuade deer to walk in the right direction before they die? Hard to tell, I couldn't ask it after it was dead. If you're worried about making bad shots, the holes on the Rages are unreal. If you're comfortable with your shooting, go with the best priced one.
Edit: Keep in mind, I'm a firm believer that someone could kill a deer with a blow dart. Granted they practiced with it enough. I'm sure I made some people mad with the "Best slug gun" reply I had. People often think that the gear has everything to do with, but in reality, it's how much you practice with the stuff, and how familiar you are with it. I might "change" my mind, if I was endorsed by a bunch of products, but that's not likely to happen anytime soon.
It's like I tell all of the people who I go fishing with. The reel isn't the most important thing about your setup. Line is number one, then rod, then reel. I could pull in fish with my hand, if I had the right line, and the right rod to withstand the force that salmon, muskies or whatever might be hanging on my horrible lure choices, makes.
I'd put my money on people being able to kill deer with field tips. As long as they put it in the wheelhouse. I'm not willing to take that risk though, not even sure if it's legal.
*Disclaimer: I am not bashing people's choices on broadheads or their ideas. I just think that once they find something that works for them, whether it be because they make their first recovery with that type of equipment or whatever, they tend to be true to that piece of equipment. Similar to me and my smoothbore Rem. 870. It works for me, so I stick to it. People are influenced by multiple things, whether it be price, friends or your local pro shop when you first go for advice. Usually what people start with, they end up using for a while.*