I don't even care about crypto anonymity I think it's a moot point when using blockchain, but yeah BTC is far from private, because it's the largest crypto it's got the most eyes on it and the most amount of chain analysis tools and trained analysts for, don't need to be FBI to track transactions with ease, don't have real stats but I'd say fair bet that btc chain has most amount of labelled wallets
But if we talking standard for anon crypto payments XMR (monero) takes the cake
Hence all tor markets swapping to xmr years ago.