Comparing BNB to Bitcoin doesn't make much sense, and there is no reason to do it. BNB is backed by the largest centralized exchange in the world and they have plenty of money available, in the worst case scenario, to buy back their own coins in the event of a continued loss of value, although this is highly unlikely, at most it can be affected by natural market volatility and burning coins as Binance usually does helps reduce the impact. Bitcoin needs no introduction, has the full support of the entire crypto community.