There no other options in my brain except these two type, that was bitcoin and ethereum. These two coin are the best for long term, we can see the potential on them are really impressive, both also always be the favorite of people because they create something changing in cryptocurrency world.
in any case, the etherium and Bitcoin are the leaders of the crypto-currency market. But the investments in these coins carry a big difference. for me, investments in the etherium are less risky than Bitcoin.
And why do you think that investing in ethereum is less risky than to invest in bitcoin? When bitcoin is the coin with the highest market cap and the one coin that most people in the forum will tell you they trust no matter what, ethereum has some detractors in the forum despite its huge size while the opposition to bitcoin is very small and only comes from people that support forks of bitcoin.