BB - you can get drop-away rests with full containment so your arrow will stay in place an be ready for a shot (I believe that is why you are asking). Now with that being said and having used both the WB and a drop-away I prefer the drop-away. The WB is a good reliable rest but will wear out and is hard on fletchings. While it is true there are more moving parts on a drop away which can possibly fail your accuracy is improved. But the possibility of such a failure is remote and I'll take the accuracy anyday. Not only does it improve your accuracy but also your effective range.