Only Bitcoin and afew other highcap altcoin is more safe for long term investment than any low-medium cap of altcoin. So if we decide to holding coins for a years is better pick BTC, and others altcoin only trade it for profit then left it. There are alot if others instrument of asset with lower risk than altcoin like Gold and high cap stocks. I been make research for alot of old altcoin, and in this bull season the price still in the bottom so very risk to make invest in altcoin for long term.