For me I still prefer bitcoin since it is more profitable but if you want other alternatives, I think next to bitcoin is Etherium or bitcoin cash. They also have future since many investor are also interested on it.
And also for me, bitcoin is always number and ethereum is next. Those two are my favorite, so i invest a little for the future. And now im also thinking to invest in bitcoin cash. Just like bitcoin, bitcoin cash will also grow in the market and will be used by many people in the future.