I believe in BTC and ETH, also on my list of coins hold: Ripple and LTC, since I believe that these coins will develop. Everyone has their favorite a few coins that they believe in.
I believe to the potential of every coin and have some investment on it too. I am waiting for the price to come up again and gain profit just like what other investors that hoping. Since the price sometimes stable and when time comes that the price is higher than when I invested, I sell them and buy again later.