I think eth and btc is the best right now. The long-term investment program ? Well, I see that the chances to get bigger profits through the long-term investment program is bigger when we really know the exact coin. Do not invest into something that you do not know nothing about. Investing in the long-time for hodl will require big risks. So learn, read, and ask before investing into something. However, when it comes true as your strategy, you will really gain the big profits. For example like last year, everyone think that they are genius trader. I myself put some amounts on NEO and EOS for the long-term investment besides a small amount of my ETH. But actually, it is just my humble opinion.