More then likely if you drop an arrow it isn't going to be with a deer in range....you will usually knock them off when there is nothing going on. At least that's when I drop things
People will say that a dropaway is more accurate then a Whisker Biscuit....and that may be true. But if you tune your setup correctly with a Whisker Biscuit it will be every bit as accurate. I know of a top Pro archer that setup his bow with one to prove this point and he shot a perfect Vegas round with one on his bow.
If you want to switch to a dropaway then go right ahead but don't let anyone tell you that rest won't get the job done.