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.