Buy Etherium, Litecoin, or ?

Bitcoin is clearly the king of crypto currencies. I don't understand the battle going on in the community right now, but recently read that Litecoin doesn't have some of the short comings of Bitcoin as far as scaling is concerned. That makes it attractive as an investment.

Similarly, I just read an article about a bunch of big banks using Microsoft's Azure-based Etherium 'Blockchain As A Service' service. With so many big companies behind it, it seems Etherium has a good chance of doing well too (though maybe not the current public blockchain?).

Are there any other reasonable contenders? Dogecoin seems too much like a parody to be taken seriously.

What I'd like to do is put $100 into a few of them and see where it goes (I did that years back with Bitcoin and am very happy).