I like XMR but “untraceable” is an overstatement and implies mathematical certainty, which doesn’t exist. A better description is that it’s computationally expensive to trace with no guaranteed outcome, which in practice is nearly as good, but isn’t the same thing as untraceable. Monero is definitely not the only one that delivers all 3 by default, nor does it have the strongest encryption. Monero’s real advantage is its ecosystem size, liquidity, and years of battle testing.