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it would be great if you can answer them both.

For Coins, the top 3 are ZCash (will fork into Zclassic soon), dash, and monero
-https://news.bitcoin.com/meet-top-3-coins-cryptocurrency-anonymity-race/

Least hackable cryptos
-It depends on the crypto, but the rule of thumb (Doesn't apply to all cryptos) is the ones with the most miners/nodes are the least hackable as they have to hack a majority of the them to do any damage. Because it is all decentralized, they can't just target one node and "Hack it" (I believe, but could be wrong(If I am, someone please correct me)).

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