Apart from Bitcoin other cryptocurrencies I feel are very important are Litecoin, and Ethereum. I don’t know about Montero, I have not used it before, but people claim that it is the number one privacy coin in the market alongside Zcash, so maybe it can be worth considering in that aspect. The ones that are really worth it for me is Ethereum and Litecoin.

Litecoin is a good cryptocurrency and offers a very good option for transactions, because it’s cheap and fast. Then Ethereum has been serving for smart contracts and has been steady leading the way for others to follow.