Whether it be new technology, miners or even an altcoin, what is the best thing to currently invest in?
I would stick with major altcoins like etheriun, dash, or litecoin and maybe a few others. The minor altcoins are probably riskier. Also, diversify with several coins and some bitcoin as well.
But I never believe into any of altcoins. I am just a pure bitcoin holder. I am very much sure when bitcoin prices will be reaching huge levels like in millions, altcoins will hit values almost equivalent to nothing. Because they need to maintain their dollar equivalent value which will force them to get dumped.
The best crypto technology till date must be bitcoin alone. Keep your investments there and have peace of mind for your rest of life too.