altcoins make a lot of claims these days and most of them are full of hot air than any real feature.
if you look around one of the most famous claims of this year was the fact that ethereum has fast and cheap transactions and can handle more transactions than bitcoin without any issues. but you can see how it is failing these days to do that claim.

as for anonymity. the only coin that does it properly is Monero. the rest of them have it but not as good as Monero does. that is why XMR has a more solid price than the rest of them.