There are few cryptocurrencies other than bitcoin that will be Monero, Ethereum, Litecoin and so is preferable for me.
I've encountered lots of different cryptocurrencies already other than bitcoin but in my opinion, I would consider Ethereum as an important one too. If you would take a look at the history of crypto, ethereum has always been next to bitcoin and I think it has something to do with how well investments and trading are occuring within it. It has also made a new all time high just like bitcoin in the last few months and many are also patronizing it. I have my investments on it too because I know somewhere in the future, it would help me reach my dream of becoming rich.